113 Come off it

(PW) stop kidding, boasting or making believe

Herbert said he was the only one who could do the job. I told him to come off it.

(free) come off it (spoken)

stop saying or doing that Come off it, Pete, there's no reason to be scared of asking her for a date.

(usingEnglish)

Meaning: I don't believe what you're saying; used as an imperative

Example: COME OFF IT; tell me the truth for goodness' sake.

(dictionary) 

Stop acting or speaking foolishly or pretentiously, as in Oh come off it! you're no smarter than they are. This term, often used as an imperative, dates from the late 1800s, when it was usually put simply as come off.