1. Inf. Stop acting arrogantly!; a behavior that must be stoped

1. Come off it, Tiff. You’re not the Queen of England.

2. First you ask for juice and then change your mind and say you want milk. I get it for you, and now you beg for water. Come off it!

2. a response to a statement that cannot be believed; Give up your incorrect point of view!

1. Come off it! You’re wrong, and you know it!

2. Come off it, Pete – you know that's not true!

3. Ask Simon to cook the meal? Come off it, he can hardly boil an egg!

4. You expect me to believe that you don’t know how that dent in the car fender got there? Oh, come off it!