Ctfu is an abreviation of the words " cracking the f*ck up " mostly used when laughing and in sms text
Zain: bruh did u hear that Thomas just got suspended for smacking the principal?!
Nathan: ctfu I hate that principal, he lowkey deserved it !
Fs- abrieviation of funny shit, mostly used to replace the word lol or reply to something being funny as shit !
Moby: ayo, guess what!
Tom: what?
Moby: zeke just pissed himself!
Tom: fsðð