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1. 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.
by Uncle J J May 23, 2005 add a video
2. 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.
by Uncle J J May 25, 2005 add a video
3. 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!
4. mushroom cap
an asshole, dickhead
dude don't be such a mushroom cap
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