you can have it!, excl. — Green’s Dictionary of Slang

you can have it! excl.

also you can keep it!

no thanks! it’s all yours! I don’t want it!

1930		D. Hammett Maltese Falcon (1965) 405: She’s a tough racket. You can have it for mine.
1934		D. Runyon in Collier’s 3 Mar. 8: You can have him.
1940		W.R. Burnett High Sierra in Four Novels (1984) 15: Not a trace of human habitation. Nothing but a... road... mountains... moonlight, and a chill wind. ‘Brother...you can have it!’.
1986		Clayton & Elliott Jazz World 25: We both said, ‘To hell with Bella Vista, Arkansas. You can have it.’.