Green’s Dictionary of Slang

poep v.

[poep n. (1)]

(S.Afr.) to break wind.

[SA]A. Fugard Boesman and Lena Act I: That gebabbel of yours. When you poep it makes more sense. You know why? It stinks.
[SA]P. Slabolepszy ‘Boo to the Moon’ in Mooi Street (1994) 128: I’m warning you, if you poep . . . !