The story
- Middle English · inherited frommonchen
- English todaymunch
From Middle English monchen, a variant of mocchen, mucchen ("to munch (food); chew audibly"; > Modern English dialectal mouch), probably imitative in origin (compare English crunch; German mampfen).
First known use, by meaning
- popularized, if not invented, by Ice Spice from August 2022 Someone who easily agrees to give oral sex.
Etymology from Wiktionary, CC BY-SA 4.0.