Oh yeah, tough guy?

Meaning

This is a sarcastic challenge issued when someone is acting overly aggressive or posturing. It is designed to deflate someone who is taking themselves much too seriously.

Sassy, confrontational

Used in a sentence

• So you think you can fix the entire engine with a butter knife, oh yeah tough guy?
• Oh yeah tough guy, why don't you go ahead and tell the boss he is wrong?
• He started puffing his chest out, so I just said oh yeah tough guy and he started laughing.