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
A shit so large it feels like the head of the hammer is coming out of your ass but then tapers of nicely for sweet relief.

Practicing lamaze techniques during this process if helpful.

The hammerhead can cause bleeding so don't be alarmed.
Now I know what having a baby feels like, I just dropped a hammerhead in the bowl.
by SavedByZero July 20, 2009
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
1.The result of generations of inbreeding. The eyes have spread apart resembling a hammerhead shark. This is to adapt to the the hostile environment of an incestuous household by allowing the hammerhead to see their father stalking his prey .

2.When a hammerhead sucks you off and begins to spas out vigorously slamming her enormous forehead onto the head of your dong.
"who invited the hammerhead to the party! She pissed herself on the bed and smeared shit all over the bathroom floor."

"that fat slut made my cock piss in two streams from her hammerhead."
by pete burns September 15, 2007
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
Strong Marijuana grown at home - especially in Bristol, UK
"Man this hammerhead is.... what was I saying?"
by snorker Major June 29, 2013
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
by malcom2020 April 28, 2011

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