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A person or character who behaves in a "random" or "wacky" manner in an attempt at humor, to the annoyance of those around them.

The term is believed to have originated from the "Vamprie: the dark ages" rulebook for the "the dark ages" roleplaying game, as a portmanteau of the word fish (notorious for their wacky/randomness) and Malkavian (a clan notorious for every member being at least partially insane.)
I'm not a fan of Deadpool because the writers tend to make him a fishmalk, rather than give him an interesting personality.
by SteevPoyo96 June 15, 2017
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