mushroomtip 

The metus, or "head" of a penis. The part that might be the subject of domes.

drip drip drip goes my mushroom tip

mushroomtip by mushroom master July 30, 2005

mushroom stamping 

The act of pressing the head of ones penis into another persons forehead or other facial area.

As soon as Ben passed out, Jer proceeded to mushroom stamp him to no avail.

mushroom stamping by Snapdragon August 8, 2003

Mushroom cock 

This is usually used as a joke when talking to friends. The penis is normal in shape untill one notices the end, where it has dramatically bulged into a mushroom shape. To get a mushroom cock one can use a lacky band so that the circulation builds up and the head swells. This person usually needs therapy or has a hot date.

Dewy: Sup bro whats been happening?
Jero: Nothing much. Got a huge pain in my penis, it's throbbing like hell. Lisa wont want to see me tomorrow.
Dewy: Hahaha, mushroom cock syndrome? Take that lacky band off the shaft so it doesnt throb you idiot.
Jero: It's not the lacky band, i took that off ages ago. This is prob from the STD i got from the rank chick that thought i had a Watermelon cock.
Dewy: Fuck!! Dude seriously you gotta stop worrying about the shape of your cock it isn't healthy.
Jero: Yer i know but the hoes love it.
Dewy: No they dont.

Mushroom cock by Mummas June 19, 2006

1-up mushroom

First seen in Super Mario Bros. Picking it up gives you an extra life. (duh!) Seen in about every Mario game.

Mario got teh 1-up mushroom!!!!!!!1111one

1-up mushroom by StraightFMan July 31, 2004

Mushroom Crush 

A violent sexual technique used on the penis. Can be considered sadistic and/or masochistic. Using one hand too masturbate and the other open hand to "Crush the Mush" in unison with upstrokes.

AKA - Mushcrush and Capslap

"Dude, that crazy bitch gave me the mushroom crush so hard my dickhead looks like a bloody plate"

Mushroom Crush by TrueRange October 30, 2009

mushroom mark

The red outline on a persons body (usually forehead) left by a heavy slapping of a man's penis. This is the result where said victim has ran their mouth too much, didn't give head, or passed out drunk.

I gave that bitch so many mushroom marks that her forehead looked like the background of a smurfs episode.

mushroom mark by kill yourself please October 5, 2005

Green Mushroom 

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."

Green Mushroom by Meish January 14, 2009