A term most often used when your friend does something dumb, cooler than something you did, owned something in a game, et cetera. However, it is not just limited to "Dammit Jerry!" Other permutations may exist, or replacing Jerry with another person's name.
Bill: Dude, you know Mia from Biology?
James: Yeah? What about her?
Bill: I hit that.
James: DAMMIT BILL!
- or -
Bill: Holy shit!? Did you just kill that guy with the Spartan laser!?
James: You know it bro!
Bill: DAMMIT JAMES!
- or -
Jerry: Hey Bill, did you get Oblivion Shivering Isles?
Bill: No, why do you have it?
Jerry: Yep! hahaha!
Bill: DAMMIT JERRY!
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