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I brought a tuna sandwich one day, so he calls me big tuna.
big tuna by Ben Shanahan April 3, 2007
a place in seattle that has the name Big Tuna
gay 1: have you heard of big tuna? it has a funny name
guy 2: no fuck off
Big Tuna by It's a stone Ruigi June 17, 2018
The Big Tuna's takin the Cowboys to the Superbowl this year.
big tuna by Biff Buttsack September 1, 2006
Big tuna is someone who is a terrible person, they are very manipulative and everything that comes out of their mouths is a lie.
My ex-gf told me they would never cheat on me, she is such a big tuna.
Big tuna by 1234spot February 7, 2020
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"
Big Tuna by Bawssey_Sauce March 17, 2013