Top Definition
an unexplained phenomenon spreading slowly though the internet in which members of dating sites, who refuse to use the site for its intended purpose, post pictures of themselves with a fish photoshopped into their mouths. This phenomenon was started by OKCupid user wryx10.
"Why is there a fish in your mouth?"

"My mouthfish is under no pbligation to explain itself to you."
by yoovie January 28, 2009
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