Green’s Dictionary of Slang

get off it! excl.

stop teasing! stop exaggerating!

[[US]R. Lardner ‘Carmen’ in Gullible’s Travels 22: Get offen that stuff! I and Carmen’s just like two pavin’ bricks].
[US]H. Simmons Corner Boy 148: Get off it, cat.
[US]L. Bruce Essential Lenny Bruce 270: You don’t say, ‘Shithead, get off it!’.
[US]B. Rodgers Queens’ Vernacular 95: get off the weed (dated, imp, late ’50s) a command to stop daydreaming [...] Syn: Get off it!
[US]R.C. Cruz Straight Outta Compton 54: ‘I bet if I fucked her I could make her scream,’ Rooster said [...] ‘Get off it!’ Clive shouted. ‘I am sick and tired of talking about her.’.