mushroom cap 

When the tip of the penis is so large and the shaft is so thin, it looks like a mushroom cap.

Condoms feel weird on me because of my large mushroom cap.

mushroom cap by Uncle J J May 25, 2005

mushroom cap 

When the head of the penis is a lot larger the the shaft. Resulting in what looks like the top of a mushroom.

Charlie soon realized that condoms felt odd on his mushroom cap.

mushroom cap by Uncle J J May 27, 2005

Mushroom Cap 

Noun-The bruise left after a man takes his penis and slaps his partner across the head.

Verb- The act of giving someone a mushroom cap.

Noun- Last night I left a huge mushroom cap on my girl's face.
Verb- I am going to mushroom cap you with my dick!

Mushroom Cap by Global Aneurysm January 29, 2012

mushroom cap 

an asshole, dickhead

dude don't be such a mushroom cap

mushroom cap by exytsygns January 3, 2008

mushroom-cap 

When two people are having anal sex and the person pitching pulls his penis out of the other one's rectum to find a large glob of santorum hanging from the end of his rod.

I probably should have expected it because we'd gone out drinking all night then eaten that greasy midnight pizza over at Cosmo's, but when we got back to the apartment she let me do anal on her and when I pulled out of her she left a big mushroom-cap hanging off the end of my rod.

mushroom-cap by Sock Sniffing Pervert July 6, 2012

purple headed mushroom cap meat sword 

a slong, johnson, one-eyed monster, the one-eyed wonder weasel and his two balls, kong, tube steak, wang, hoo-hoo dilly, bonky, rudusrod, fuck stick, frank and beans, salami, penis, male genitalia, cock, ding dong, dong, tally whacker, goober, poker, stick, rod, pole, skin flute, sly trombone, meat, gun, hose, winky, wanker, meat sword,

a purple headed mushroom cap meat sword, slong, johnson, one-eyed monster, the one-eyed wonder weasel and his two balls, kong, tube steak, wang, hoo-hoo dilly, bonky, rudusrod, fuck stick, frank and beans, salami, penis, male genitalia, cock, ding dong, dong, tally whacker, goober, poker, stick, rod, pole, skin flute, sly trombone, meat, gun, hose, winky, wanker, meat sword,

purple headed mushroom cap meat sword by 12" dick and a dozen roses May 3, 2009

Mad Cap Mushroom

A mushroom cultivated by Night Goblins, which, when brewed into a beer, is one of the most intoxicating subtances not known to man. The beer is often force-fed to unfortunate gobbos 3-4 hours before a battle. He is then given a huge ball on the end of a chain. His mates than hold on VERY tightly to him (sitting on the gobbo when required. They know that if he starts swinging that ball ANYWHERE near them, they're going to meet Gork (and possibly Mork). When the unfortunate enemy aproaches, he is given a push in their general direction, and the best is hoped for.

"Gork! Mork! Waaagh!!!"

Mad Cap Mushroom by Warhammer Nerd March 24, 2004