French expletive, litteraly "Go fuck your mum".
Mostly used by kids as an act of
rebellion against someone they hate, or simply as an expression of their
disagreement/anger. Most of the time though, they don't realize what they're saying since they're merely imitating the wechs they heard, or they're
running out of insults.
Kid #1:
va te faire foutre!
Kid #2: j'temmerde!
Kid #1: PD sans
couilles! (literally "ball-less homosexual", lmao.)
Kid #2: nique ta mere
fils de pute!