Khus
ka lainda is a Urdu swear word invented by Mehraz Ali
Khan and popularized by Nawazish
Ali Nusrat. The meaning of this word is unclear and vague but it is still a very cool thing to say.
ABC: Yaar, mera aaj phadda
haiXYZ: Kon khus ka lainda
hai woh, main jaa ker peet-
ta hoon usse
Translation
ABC: I have a fight today
XYZ: Who's that khus ka lainda? I'll beat him up.