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A euphemism for I don't give a shit. Especially useful in response to unsolicited bragging or otherwise useless information. Stems from Costanza in The Opposite episode of Seinfeld.

Seinfeld: Chicken salad's not the opposite of tuna. Salmon's the opposite of tuna. Cause salmon swims against the current and the tuna swims with it.

Costanza: "Good for the tuna."
douche: "I worked really hard this weekend, but it payed off -- my boss said I did a great job!!"

dude: "Good for the tuna"
by ChrisGGG November 06, 2010
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