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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
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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

big tuna pizza 

this is when you take a slice of pizza(whatever kind you want) and you take and put it up a girls vaginas so that way your penis can fit into the pizza. this increases the orgasm, the grease is a good lube, and the pizza taste even better after
i did the big tuna pizza to evan busch while grant craig mike dom and joe were having sex. it was a crazy orgy
big tuna pizza by ginganinjaistheman September 28, 2010
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