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When a person starts to swim so much that their face and mouth start to turn into ones of a fish
Person 1: Hey his face is fucked up he looks like he has trouble breathing

Person 2: Naw thats just charlie, he joined the swim team in the beginning of the year, mild case of Swimmer's Mouth.

Person 1: OH GOD DAYUMMMM!!!!
by SwallowSista January 12, 2011
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