Green’s Dictionary of Slang

chomp v.

1. (US gay, also compon on) to fellate, to perform fellatio.

[US]‘B. Cochran’ Crotch Bait 34: ‘That cock sure is a beauty,’ she said. ‘Come over here and let me chomp on it for a while’ [Simes:DLSS].
[US]‘R. Cummins’ Suckhappy 83: That was my meat distending his jaw, my meat he was chomping [Simes:DLSS].
[US]Tearoom Tales (N.J.) Nov. 123: No sooner had my dick gone into the opening that a wet mouth chomped over my purple knob [Simes:DLSS].
Manscape (N.J.) Mar. 26/1: [H]e felt the gardener’s mouth chomp on his swelling cock [Simes:DLSS].
www.advancedmasturbation 13 Mar. 🌐 I chomped my buddys girlfriends pussy, she tongue-fucked my moms, and my mom deepthroated my dick [Simes:DLSS].

2. (US campus) to be disgusting, unappealing, second-rate [orig. computer jargon].

A. Naiman Computer Dict. 312: This new editor really chomps [HDAS].
E. Raymond Jargon File 4.3.1 🌐 chomp vi. To lose; specifically, to chew on something of which more was bitten off than one can. Probably related to gnashing of teeth.