expression
fuck you!; don't fuck with me!; don't fuck around!
Vulgar, aggressive contraction of ふざけるなよ. Used to express strong anger or to tell someone to stop messing around. Very informal and confrontational.
See also: ふざけんな
ざけんなよ、ふざけたこと言うな！
Fuck you, don't say stupid shit!
ざけんなよ、もう我慢ならねえ。
Don't fuck with me, I've had enough.