Green’s Dictionary of Slang

bowel n.

In compounds

bowel baby (n.)

(US) a general term of abuse.

[US]S. Morgan Homeboy 342: You’re going to Z Block, bowelbaby.
bowel-disrupter (n.) (also bowel-disturber, ...-ravager)

(US) a notably large penis.

‘David Coppafeel’ Snuffy in ‘Wild Oats’ 12: [comic strip] A mad scramble is made by Dizzy Little Lil’s tarts for the first lay by Snuffy’s mastadonic bowel disrupter [Simes:DLSS].
[US]in B. Adelman Tijuana Bibles 94: Lotta rode that bowel-ravager like a rabbit.
[US]B. Adelman Tijuana Bibles 107: That big bowel disruptor could tear the insides out of a woman.
bowel starter (n.)

(US) a large penis.

[US]Stag Party 95: Liberal allowance made for button-hole pricks, commonly called cunt robbers, hair curlers, liver disturbers, kidney wipers, belly ticklers, bowel starters, etc.
Actionable Offenses ‘The Whores’ Union’ (2007) [cylinder recording ENHS 30188] [as cite 1888].

In phrases

bowel off (v.)

(US) to have an attack of diarrhoea.

[US]Randolph & Wilson Down in the Holler 229: Tom he was a-pukin’ an’ a-bowellin’ off somethin’ turrible, so finally they sent after Doc Holton.