Big tuna is someone who is a terrible person, they are very manipulative and everything that comes out of their mouths is a lie.
by 1234spot February 7, 2020
 Get the Big tunamug.
Get the Big tunamug. by Miss Chananandler Boong July 9, 2015
 Get the Big Tunamug.
Get the Big Tunamug. Jim from "The Office"
by Ben Shanahan April 3, 2007
 Get the big tunamug.
Get the big tunamug. by It's a stone Ruigi June 17, 2018
 Get the Big Tunamug.
Get the Big Tunamug. by Biff Buttsack September 1, 2006
 Get the big tunamug.
Get the big tunamug. 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"
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
 Get the Big Tunamug.
Get the Big Tunamug. 