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."
door Meish 29 september 2008
Something one says when is given an unexcpected bonus.
Joerge not only gave me his stereo, but 5 CDs as well. So that was a big green mushroom.
door Miyamoto 9 oktober 2005
As in the Mario series when one gains a green mushroom the words "one up" flash on the screen, this is when you tell a story and someone else tries to tell a story better than you.
John: "i once skydived"

Bob: "yeah well i skydived and shot 4 ninjas whilst slaying a dragon and throwing the ring into Mt. Doom."

John: "Green Mushroom me again and you die."
door jameswilson 21 december 2009
In an exchange of burns and insults, dealing a comeback better than the previous diss.
That was an awesome 1-up about his mom. You totally green mushroom'd him!
door placatedmayhem 7 juni 2007

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