Green’s Dictionary of Slang

(US) a general term of abuse.

1990

S. Morgan Homeboy 342: You’re going to Z Block, bowelbaby.

the stomach.

1824

J. Wight Mornings in Bow St. 270: [She] planted another kick on his bowel-case.

(US) a large penis.

c.1888		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.
c.1895		Actionable Offenses ‘The Whores’ Union’ (2007) [cylinder recording ENHS 30188] [as cite 1888].

(US) to have an attack of diarrhoea.

1953

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.