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hammerhead 

In the process of getting road head on the highway, you drift your car over to the side and begin hitting every bit of rumble strip that you can find. Thus creating a vibrating sensation know as hammerhead.
When the road head just wasn't enough to get off, Johnny used the rumble strips of the highway to get hammerhead.
hammerhead by bkrazy November 17, 2006

hammerhead 

Derisive nickname used by my boyfriend when I do something ditzy - a reference to the term "dumb as a bag of hammers."
Nice move, hammerhead.

Hammerhead 

When a rectangular object is placed sideways under the foreskin, making the penis resemble a hammerhead shark.
A kinky girl i am seeing put a domino in my foreskin last night, it made my cock look like a hammerhead shark.
Hammerhead by bosteonerbeka March 22, 2010

hammerhead 

The act of slapping your penis against another person's forehead as a form of an insult.
Most fratboys lock themselves in their giant houses and chase one another with their pants off to give each other wicked hammerheads.
hammerhead by lankysob December 28, 2005

hammerhead 

an older woman who preys on young men in their late teens and early twenties.

a woman who robs cradles.
yeah, that chicks a cougar

no way dude, that kids 19... shes a hammerhead
hammerhead by malcom202020 May 21, 2011

hammerhead 

A penis with a very large head. Often causes bleeding and/or causing the other person to become awestruck.
'Check out that hammerhead!'

Another word meaning fucked hard.
Wow, that massive shaft is such a hammerhead!
hammerhead by willie989 January 18, 2010