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1.
The mother of all comebacks, unparalleled by any other. Normally used when you're fresh out of spunk.
Example 1:
Guy: "ur m0m iz l4m3r."
You: "You're that."

Example 2:
Guy: "i m ub3r l33t h4x0r!"
You: "You're that."

Example 3:
Guy: "What the fuck is your problem?"
You: "You're that."
by Deacon August 06, 2004