To mushroom is to, when singing along to a song, either mumble or sing the wrong words, revealing that you don't really know how the song goes. When someone does this, everyone around them yells "MUSHROOM!" at them, as a way to embarrass them.
Matt: If you wanna be my lover, you have got to give....doo doo doo...but that's the way it is!!

Nick: Oh Matt, you totally just Mushroomed!

Everyone in car: MUSH-ROOM! MUSH-ROOM!
by The Rascal King October 30, 2007
A way to masturbate where you hold the shaft and rub the tip of your penis in a circular motion.
The mushroom is one of the best ways to masturbate.
by hqwfhf May 24, 2008
As seen in the intervals between fields of dancing badgers.
Badgerbadgerbadger MUSHROOM MUSHROOM!
by Kung-Fu Jesus June 07, 2004
1. Something that when eaten cuz fuck ur brain up
2. Shrooms
Man let me get some of those mushrooms
by K-Wo February 11, 2003
a poisonous fungi grown mostly in shit or on damp logs, that makes you get in touch with your holographic spirit, oh and you trip. the trip lasts for 4 to 8 hours. try some dutch shrooms. goddamn.
by lefty September 16, 2003
mushroom is a drug that messes up ur senses.
u can't sepparate the REAL WORLD from the IMAGINORY WORLD.
Some one who took mushrooms thought he could fly, went up on a High building and jumpped down. It was too late when he realized that he couldn't fly, 'cause he jumpped already
by Slim-Jim October 30, 2006

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