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 16, 2007
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Another word for a good looking girl.

ie: biddy

pronounced *ham*-*ah*-*head*
by TheFirstDoc September 12, 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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Drew fatslinger's pyscho dirtbag girlfriend whose eyes are spread so far apart that her head takes on the form of a hammerhead shark.
Ashley is a hammerhead whore whose pussy smells like scallops and gets no satifaction from Drew's tiny flacid snail weiner.

Ashley: "Drew, why do those cool ass motherfuckers you call friends call me hammerhead behind my back and sometimes to my face when they dont think I can hear them?"

Drew: "Because, your fat nasty head is so big that it causes your retarded eyes to spread ridiculously far apart you look like a dirty fucking hammerhead whore."
by chonger December 3, 2005
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An evolution of the turtlehead. A hammerhead occurs when the turtles head is squashed between your butt cheeks into a boomerang style shape not disimilar to the head of the afformentioned hammerhead shark.
Reg was taking a dump when the fire alarm went off. He jumped to his feet, buttocks tensed and then realised he had given himself a massive hammerhead.
by craftyscouser March 21, 2011
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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.
I was sleeping and right when I woke up and headed for the bathroom I noticed my hammerhead
by jive robots November 3, 2010
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