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The one-upping of another's story or comment with one of your own, with the goal of impressing others.
Waiter: Have a nice day!
Thomas: You have a better one!

Mason: I think I caught the flu, I'm feeling pretty bad.
Thomas: I don't feel so hot either, since I have Crohn's.
Micah: that's a Hammonism!
by Lubison710 October 10, 2011