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An exclamation or expression of dislike, objection or frustration targeted towards a specific circumstance, object, event, person, or pretty much anything else that is particularly unfortunate or negative for whatever reason.
Person A: Allison can't come to the mall today because her mom wants her to stay at home.
Person B: That's so loser!

Person A: Did you notice that Kim wore the same exact dress as you to the party?
Person B: That's so loser!

Person A: Sorry I didn't call you back last night. My phone died.
Person B: That's so loser!
by Monica Landy August 01, 2008
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