A girl lays on a bed legs spread, vigorously double fisting her vagina, while a guy stands at the far corner of the room and he is bending over. He places his hands on his head thus imitating the dorsal fin of a shark. He charges forward toward his pray and plows that pussy into oblivion with his head creating the image of the elusive hammerhead shark.
Wow my vagina hurts. WHY? My boyfriend hammerheaded me several times yesterday.
by B2daALLZ September 01, 2006

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Top Definition
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

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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

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Another word for penis you can say in public
Earl left his hammerhead mark in the vaseline
by V dux August 28, 2007

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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

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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

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A woman's breasts, but only when they are so large that when laying down they spread to the sides.
She's got a nice set of hammerheads!
by angry gnome October 14, 2008

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When ur purple head is three times the size of ur Dangler.
KJ: Hey Greame why is ur purp head so big?
Greame Mann: Da Whaaaat?
KJ: Wow that must be a Hammer head.
Greame: FUCK YOU!
by Kyle Joudrey April 24, 2008

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