Green’s Dictionary of Slang

(US Und.) child molester.

1992		Bentley & Corbett Prison Sl. 35: Cho-mo An inmate who is in prison for child molestation.
2002		J. Lerner You Got Nothing Coming 44: Nevada prisons are crawling with punks, J-Cats, snitches, and child molesters (called Chomos).
2009		J. Stahl Pain Killers 270: What kind of freak we talkin’ about? He some kind of chomo?
2022		J. Hannaham Didn’t Nobody Give a Shit 47: [in fig. use] Time is a chomo, honey, sure gon mess wit a kid, damage her for life.