Green’s Dictionary of Slang

1. (orig. US) to vomit; thus upchucking n., the act of vomiting; upchuck n., vomit.

1936		(con. 1920s) Dos Passos Big Money in USA (1966) 906: He had to stop to upchuck on the side of the road.
1953		L. Uris Battle Cry (1964) 365: The wicked-looking Marines [...] upchucked into the ocean.
1961		F. Kohner Gidget Goes Hawaiian 11: My old man just up-chucks when Larrie calls him Freddie.
1970		L. Sanders Anderson Tapes 231: [M]y wife was sick; she upchucked.
1989		C. Hiaasen Skin Tight 176: Maggie Gonzalez upchucked gloriously all over Chemo’s gun arm.
1999		T. Dorsey Florida Roadkill 18: If only she would stop upchucking, I can still score.
2001		‘Randy Everhard’ Tattoo of a Naked Lady 135: Shades convulsed with more upchuck.
2005		J. Stahl I, Fatty 57: If you’re lucky, you’ll just scare people. Most likely you’ll make ’em upchuck.’.

2. as play on lit. use of ‘throw up’.

1989

B. Reed ‘Messman on C.E.’s Altar’ in Passing Strange (2015) 15: They hadn’t as yet by then torn down ther working-class cottages to upchuck the North Sydney Business district.