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29.
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.
by lankysob November 22, 2005
5 14
 
1.
A person who is heavily intoxicated to the point that his/her eyes deviate away from their head (much like how a hammerhead shark is)
Dude, you were so hammerhead last night!
by HurricaneGordon November 18, 2009
62 36
 
2.
A person who enjoys eating out excessively bloody assholes. They typically bite off small chunks of flesh in the process, adding to the bloody carnage.

Hammerheads usually perform this action in groups as part of a "feeding frenzy."
That hammerhead is eating mad time asshole! Look at all that blood!
by UsedDinger October 23, 2013
8 2
 
3.
Another word for penis you can say in public
Earl left his hammerhead mark in the vaseline
by V dux August 28, 2007
38 34
 
4.
Term used in the cycling community for a really gung-ho athletic rider, the kind with an intense training regimen and a "need for speed." Named for their habit of dropping the hammer, or launching into unnecessary bursts of speed, particularly blowing off weaker riders in recreational group rides. In extreme cases, they've been known to blow off traffic lights and laws just to go fast. Too often matching the stock image of the athletic, lycra-clad scofflaw, they're often blamed for perpetuating a lot of ugly stereotypes about people on bikes.
"I get to the intersection on my bike, and just when I get the light, some hammerhead blows off the intersection right across my bath! He cuts me off, AND all those cars. Then they all start honking at me, even when I signal properly, because they think I'm a jerk, too. I'm just trying to get to work!"
by The Urban Husky October 30, 2011
10 8
 
5.
(n.) One who is slow in grasping an idea or concept. One who talks the talk but cannot walk the coroporate walk. An albatross around the neck of any company, quite likely to scare away the customers. Hammerheads are often killed in road accidents.
Elitist sure is a hammerhead.
by Kung-Fu Jesus May 09, 2004
49 47
 
6.
To grab the shaft of the penis leaving only the head sticking out and slamming the head with an open palm.
She was so mad at him for cheating she gave him a hammer head.
by pcstrebel February 03, 2010
18 18
 
7.
Hammer head is someone who uses heroin and shoots up a lot, or likes to chase the dragon.
person 1: hey wanna buy some smack?
person 2: nah mate i'm not a hammer head
by calais kid November 16, 2009
14 15