The origin for the kanji for tuna (鮪) comes from it being a fish (魚) that can be found living (有る) in many seas!This kind of attitude in bed used to be called a "frozen tuna" but eventually the "frozen" part was omitted and is now simply referred to as a "tuna".
English equivalent terms would be a dead fish, dead lay or a starfish.I'm going to die if I don't eat sushi!
A silly game or "bakage" of the same exact name about a man who needs to run around and eat sushi or else die, that became popular with Japanese netizens due to its over-the-top and straightforward gameplay and story. Originally released for free on the developer, Tadasumen's website, Kuso Site (Shit Site), but eventually became a commercial release with its own sequel.5/2 is World Tuna Day!
Tuna is overfished worldwide due to its high demand but low populations.