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Verb that happens when someone gives a sip of their beverage (perferabally a canned beverage) and the person who's drinking puts their mouth all over it.
Matt- Hey there Sally, can I have a sip of your new beverage straight out of that can?
Sally- Why yes, you can.
*Matt takes a sip*
Sally- What the hell Matt why would you fish-mouth the drink like that, i don't want it now.
by mikeamil January 31, 2008
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Eye of a penis, small and slitty
Jeremy had an STD which caused a painful sensation when he pissed through his fish mouth
by deadfrog1976 October 16, 2007
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