The name for what your penis looks like when only the head of the penis fills with blood and you don't actually have an erection. It could happen when sitting down and then standing up quickly or anytime.
by jive robots November 3, 2010

by snorker Major July 16, 2013

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.
by bkrazy November 17, 2006

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.
by Blonder by the minute January 19, 2004

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.
by bosteonerbeka March 22, 2010

Most fratboys lock themselves in their giant houses and chase one another with their pants off to give each other wicked hammerheads.
by lankysob December 28, 2005

an older woman who preys on young men in their late teens and early twenties.
a woman who robs cradles.
a woman who robs cradles.
by malcom202020 May 21, 2011
