Knock Yourself Out By EvilMarch 24, 2015February 25, 2020Popular Expression Knock Yourself Out = go for it, try to do something yourself *IMPORTANT NOTE: This meaning of “knock yourself out” doesn’t mean to lose consciousness. Ex: So if you think you can solve the puzzle, go ahead and “knock yourself out.” Ex: Person # 1 Can I have try a piece of your food? Person #2 Sure, “knock yourself out.” BACK to Popular Expressions