Green’s Dictionary of Slang

ralph v.

also bob, rauf
[echoic]

(US campus) to vomit.

[US] in Current Sl. (1967) I:4.
[US]G. Underwood ‘Razorback Sl.’ in AS L:1/2 55: Ralph ‘to vomit’.
[Can]Totally True Diaries of an Eighties Roller Queen 1 Sept. [Internet] John got drunk off four beers and was ralphing his guts out.
[UK]M. Belmonte Compter Science and Why (1993) [Internet] I was struck with [...] the plethora of words and phrases meaning ‘vomit’ and/or ‘to vomit’ [...] At most American colleges and universities, a weekend cannot pass without seeing multitudes [...] rauf.
[US]A. Heckerling Clueless [film script] Oh, actually, I was really bad today, I had two moccacinos, I feel like ralphing.
Online Sl. Dict. [Internet] bob v 1. to vomit. (‘I think I’m gonna bob!’).
[US]C. Cook Robbers (2001) 65: Flew from Baton Rouge to Shreveport one time, lost my lunch. Ralphed in a sack.