An expression said to those who feel the need to state the fucking obvious.
Recipient: “You can’t breathe through your ass”
Sender: “Well, No fuck”
Also see: No Shit, No Fucking Shit, duh
No Fuck: define #2
an ugly whore with an STD that should that you should not have sexual relations with under any circumstances
Guy 1: That girl is looking good.
Guy 2: Keep away from that shit, shes a no fuck.