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To curl your lips over your teeth, then bite another person. It doesn't hurt, and it resembles how a fish would bite.
"Quit Fish Biting me, you weirdo!"

"A Fish Bite on the face can be just as good as a kiss, and less painful than a bite"
by Mair Mair September 12, 2006
(noun) - a circumstance of underwear that have crept up into the butt crack.
I hate these underwear. They keep giving me fish bite.
by 4whatitsworth January 13, 2012