Green’s Dictionary of Slang

momo n.

also mo-mo
[abbr. SE mo(ron) + redup.]

(US) a stupid person.

[US]Wentworth & Flexner DAS.
[US]J. Rechy City of Night 52: Theres gonna be hobos! homos! and momos! in Our Park long after youve grown deaf and dumb.
[US]R. Price Ladies’ Man (1985) 86: La Donna would be sitting there with some big momo from Duluth front row centre.
[US](con. 1970s) G. Pelecanos King Suckerman (1998) 20: Standing there, sipping their drinks like a couple of mo-mos.
[US]Ebonics Primer at 🌐 momo Definition: a person of low intelligence Example: Listen to me, you dumb fuckin’ momo!