also: ふざけんじゃねえ · ふざけんじゃね
expression
stop messing around!; get real!; stop screwing around!; screw you!
Colloquial, rough, and often confrontational. Used to tell someone to stop joking, being silly, or acting insincerely. Can range from light exasperation to strong anger depending on tone and context.
ふざけんじゃねー、真面目にやれよ。
Stop screwing around and do it seriously.
そんな嘘ついて、ふざけんじゃねーよ。
Don't give me that crap — get real!