Delulu: The Short Answer
“Delulu” is internet slang for “delusional.” It describes someone holding wildly unrealistic beliefs or fantasies — often in a playful, self-aware way. The word emerged in K-pop fandom in the early 2010s, spread across social media in the early 2020s, and took on a second, positive meaning on TikTok around 2023: bold, joyful self-belief in your ambitions, captured in the phrase “delulu is the solulu” (delusion is the solution).
The Definition of Delulu
Merriam-Webster’s slang entry defines “delulu” as an internet slang term for “delusional,” noting that in some contexts it describes someone with “an unapologetic, bold, and often joyously self-confident belief in the likelihood of realizing one’s ambitions.”
The Cambridge Dictionary, which added the word in August 2025, defines it as “believing things that are not real or true, usually because you choose to.”
So “delulu” has two main shades of meaning:
- The original sense: unrealistically fantasizing — usually about celebrities, crushes, or unlikely scenarios.
- The newer TikTok sense: deliberately optimistic self-belief — choosing confidence over realism as a mindset.
Where Did Delulu Come From?
“Delulu” is shortened from “delusional,” with a reduplicated “-lu-” added for expressive effect. According to Merriam-Webster, the word emerged in the early 2010s among K-pop fans online, where it was used as a mild rebuke of opinions about celebrity “stanning” (obsessive fandom) and “shipping” (hoping for romantic relationships between famous people) that seemed irrational or obsessive.
A classic early use: a fan insisting their favorite idol is secretly in love with them would be called “delulu” by other fans. It was teasing, not clinical — closer to “you’re dreaming” than to an actual accusation of delusion.
The term spread outside K-pop as a general synonym for “delusional” across social media in the early 2020s.
The TikTok Reinvention: “Delulu Is the Solulu”
Starting around 2023, especially among young women on TikTok, “delulu” flipped from an insult into a badge of honor. The new logic: a little self-delusion is a feature, not a bug, when you are chasing ambitious goals.
Two phrases captured the shift:
- “Delulu is the solulu” — delusion is the solution. Believe in the outcome hard enough and you might make it happen.
- “May all your delulu come trululu” — may all your delusions come true, with “trululu” modeled on “delulu.”
In this context, “delulu” overlaps with manifestation culture and positive psychology: the idea that confident belief shapes results. It is deliberately tongue-in-cheek — users know the belief is unrealistic, and that self-awareness is the joke.
How to Use Delulu in a Sentence
Original (teasing) sense:
- “She thinks the barista smiled at her because he’s in love with her — she’s so delulu.”
- “I’m delulu enough to believe I’ll get front-row tickets.”
New (confident) sense:
- “You have to be a little delulu to start a business with no funding.”
- “Applied for my dream job with zero qualifications. Delulu is the solulu.”
- “Manifesting the promotion. Stay delulu, everyone.”
Like rizz, “delulu” moved from niche online communities to mainstream dictionaries — like copium, it puts a playful spin on self-deception, and like crine, it shows how quickly Gen Z slang earns a dictionary entry.
Delulu vs. Delusional
The words are related but not interchangeable:
- Delusional is the standard English adjective. In psychology it can describe a clinical symptom — fixed false beliefs. Using it casually can sound harsh.
- Delulu is slang: softer, funnier, and usually self-aware. Saying “I’m being delulu” signals you know the belief is unrealistic. Saying “I’m being delusional” sounds more serious.
That self-awareness is the whole point. “Delulu” almost always carries a wink.
Dictionary Recognition
“Delulu” earned mainstream dictionary recognition in August 2025, when the Cambridge Dictionary added it among 6,000+ new entries, alongside words like “skibidi” and “tradwife.” The publisher cited real-world usage — including Australian Prime Minister Anthony Albanese’s 2025 remark “delulu with no solulu” — as evidence the word had staying power.
Merriam-Webster covers the term on its slang pages with a full etymology, tracing the K-pop origins and the TikTok-era reinvention.
Frequently Asked Questions
“Delulu” is slang for “delusional” — holding wildly unrealistic beliefs or fantasies, usually in a playful, self-aware way. On TikTok it also means bold self-belief: “delulu is the solulu.”
It is shortened from “delusional” with a reduplicated “-lu-.” It emerged in K-pop fandom in the early 2010s, spread across social media in the early 2020s, and was reinvented on TikTok around 2023.
It means “delusion is the solution” — the playful idea that a little unrealistic self-belief can help you achieve ambitious goals.
Yes. The Cambridge Dictionary added “delulu” in August 2025, and Merriam-Webster covers it on its slang pages.
It depends on context. In fandom it started as gentle teasing. Today it is often affectionate or self-applied — many people proudly call themselves delulu.
“Trululu” is a playful coinage modeled on “delulu,” from “true.” The phrase “may all your delulu come trululu” means “may all your delusions come true.”
