a man, usually heavier built, who can handle mass quantities of alcohol and/or weed and still keep going.
Joe: "You see that bigger guy over there just slamming those beers down?"
Mitch: "Ya man, thats Bill... he's such a tankapotamas."

Jared: "Dude, Josh, you've hit that bong like 8 times!"
Josh: "Yo bro, i'm a motha fucking tankapotamas"
by MoneyChimp February 19, 2010

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