Green’s Dictionary of Slang

Wallace (and Gromit) v.

[rhy. sl.]

to vomit; also as n.

personal correspondence: Wallace and Gromit – Modern Rhyming Slang for ‘vomit.’.
D. Shaw ‘Dead Beard’ at www.asstr.org 🌐 Whoever he is, if he knew what was going down right now he’d be doing a real wallace and gromit.
‘Alcohol’ Doctorjob.com 🌐 Tart fuel (alcopops) – ‘tell you what, I’ll get you a bottle of tart fuel instead, but don’t blame me if you Wallace.’.