come off it

Meanings

1. An expression of disbelief.

1. To stop doing something or stop talking about something.

Etymology

Originally a British shortening of "come off the grass!", an older (originally American) phrase. Come off the grass!, which is roughly indicative of the speaker's disbelief, or that the speaker believes that the one being spoken to needs to face reality, is ultimately a play on the oft-seen phrase on signs in places such as public parks: "keep off the grass".