a fat, lazy person who just wallows around in his own deep-sea bullshit all day. He or she typically lives with his parents and plays video games all day.
Garry: "Hey, where's Mike?"

Aaron: "That Big Tuna? He's probably playing video games in his parents' basement."

Garry: "Should we call him?"

Aaron: "Nah, he's probably busy on 4chan"
by Bawssey_Sauce March 17, 2013
A large penis that is proportional to a tuna can.
They don't call him Big Tuna for nothing.
by The Big Unit February 21, 2005
Brittany Gann.... From Charlestown Indiana
Brittany Gann(aka) Big Tuna
by ninja babe November 15, 2004
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