1 definition by Meish

Top Definition
A person who insists on one-upping you everytime.
Derived from Mario Bro's -1up
Person A: "I sprained my ankle the other day."
Person B: "Yeah well I broke my ankle once and got the flu. Plus I haven't slept in 48 hours. I'm so tired."
Person A: "You're such a Green Mushroom, Nick."
by Meish September 29, 2008

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