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Etymology
From a blend of poo poo and fart.

Noun
shart (plural sharts)
1. (informal, colloquial, vulgar) the release of feces, often unintentionally, during flatulation.

Verb
shart (third-person singular simple present sharts, present participle sharting, simple past and past participle sharted)
1. (informal, vulgar) to emit fecal material at the moment of flatulation; to defecate slightly while farting; to poo poo and fart at the same time.