expression
look who's talking; you're one to talk
A familiar, often blunt retort used when someone criticizes another for a fault they themselves have. Typically used among close friends or in rough speech; can be rude in polite contexts.
「遅刻するなよ」「お前が言うな」
"Don't be late." "Look who's talking."
「もっと勉強しろ」「おまえが言うな」
"Study more." "You're one to talk."