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1.
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 hai

XYZ: 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.
by Olympiad walay mailay October 19, 2010