Delulu
Delusional
Example
I am going to meet Shakira, and she's going to fall in love with me.
Boy, you delulu.

Related Slang
Stan | An obsessed fan of someone or something |
Superfan | An extremely dedicated fan |
Idol | A K-pop star |
OTP | One true pairing |
OT3 | One true threesome |
K-pop | Korean Pop music |
Headcanon | A fan's unverified beliefs about a story |
Shipping | Hoping for two people to get into a relationship |
Delulu is short for "delusional," and it is often used by fanboys and fangirls to mock other superfans' beliefs.
For example, a K-pop stan who believes they will one day meet and start a relationship with their favorite idol may be called delulu by other stans. Shippers who ship different couples may also call each other delulu, as they argue the merits of their OTPs.