Green’s Dictionary of Slang

1. (orig. US) to hit or strike; also fig. use; thus whamming n.

1915		Van Loan ‘On Account of a Lady’ in Taking the Count 139: Wear him down wit’ dat left an’ den wham him wit’ de right.
1924		Hecht & Bodenheim Cutie 46: One of them whams you on the skull with a near beer bottle.
1930		E.H. Lavine Third Degree (1931) 48: Whack – whack – whack! [...] And the whamming continues.
1942		H. Miller Roofs of Paris (1983) 160: Right on the very table with her ass bare and this guy whamming it into her.
1950		A. Buckeridge Jennings Goes To School 239: After you’d whammed it in.
1959		W. Hall Long and the Short and the Tall Act I: And then you wham ’em – thump across the eyes.
1961		(con. 1920s) J. Sparks Burglar to the Nobility 32: I whammed at this window with my hammer.
1969		‘Iceberg Slim’ Pimp 75: He caught a stud whamming it into her.
1974		Eble Campus Sl. Mar. 6: wham (v. or n.) – cutting, hostile or contemptuous remark: You really whammed that freshman when you told her that she acted like a grammar school reject.’.
2008		R. Price Lush Life 37: Going back to hard whamming like moving a credenza .

2. to throw hard.

1927

R. Lardner ‘Hurry Kane’ in Coll. Short Stories (1941) 89: He whammed a fast one acrost that old plate that blew Tierney’s cap off.