Green’s Dictionary of Slang

poop n.2

[SE poop, echoic of the report of a gun and thus the sound of defecation]

1. [mid-18C; 1930s+] the act of breaking wind.

2. [late 18C; 1940s+] (orig. US) rubbish, tripe, nonsense.

3. [1920s+] (also poopee, poopy) excrement, an act of defecation.

4. see poop-chute

In compounds

poop-bag (n.)

[2000s] a colostomy bag.

poopbutt (n.)

see separate entry.

poop-chute (n.) (also poophole, poopshoot)

[1970s+] the anus.

poophead (n.) [-head sfx (1)]

[1970s+] (US campus) a fool, a dullard.

poop stick (n.) [stick n. (2b)]

[1920s-30s] an unpleasant, priggish person.

In phrases

take a poop (v.)

[1960s] to defecate.