うんこ

Etymology
From.

Noun

 * 1)  poop, doo-doo, number two

Usage notes

 * An informal and somewhat childish word; compare the more formal.
 * While うんこ (unko) is sometimes given as a literal translation of English interjection as an expression of displeasure, this is inaccurate, as unko! sounds more like someone saying “Oh turd!” or “Oh doo-doo!” in English. Rather, the vulgar  or the less vulgar  may be used, while the most common expression of displeasure is.

Verb

 * 1)  to poop, to poo, to go number two