Mushroom hammer 

When a female grabs the shaft of an erect penis, then using her other hand makes a fist and a hammer motion, smashing the head of the penis.

So jake pissed a girl off again last night, and during what he believed was his victory blowjob for winning the argument he was brought to the fetal position with a brutal mushroom hammer.

Mushroom hammer by Francis the fantastic May 20, 2014

Eskimo mushroom hammer 

1. this is when you bludgeon and kill a seal with your erect penis
2. this is when you awaken your significant other by hitting her repeatedly in the face with the head of your penis. (see also: Australian alarm clock.

1. Even though the eskimo mushroom hammer is fun, PETA is strongly against it.
2. Lisa prefers the eskimo mushroom hammer to the australian alarm clock.

Eskimo mushroom hammer by georgelopez October 22, 2008