Top Definition
A clingy person who follows you around incessantly. Often used to describe someone mildly annoying or irritating that won't go away. Named after the long string of fecal matter sometimes seen still attached to a fish's rectum as they swim.

Origin: Japanese
I was wanted to be alone with my girlfriend, but my little brother was being a total fishpoop and wouldn't take the hint.

Gary was always inviting himself along whenever we went out. What a fishpoop.
by Capt Dangle July 19, 2010
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