verb/fɛʁ lə ma.lɛ̃/
to get wise, get cute, to act smart, to try to be clever, to be impertinent
“Tu feras moins le malin quand la police se sera rendue compte que tu leur as menti.” — You'll be laughing on the other side of your face when the police find out you've been lying to them.
Synonyms: frimer, se la péter, faire le fier