[Dilznoofus]

He could represent anything that beats QQ, KK or AA given preflop action. Wouldn't you put in a raise here if you had Jx, TT or 22?

I think I like it, though I hardly ever actually try this myself.

edit: I don't think I'd push though. Making a smaller raise is more credible and allows you to fold if he decides you're full of it and pushes.