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
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 02, 2010
A person with a head resembling a hammer, usually with no chin.
Did you see that kid back there?
Ya. One ugly ass hammer head chunkard.
by OwlTurtleMeerkat October 06, 2010
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
Another word for a good looking girl.

ie: biddy

pronounced *ham*-*ah*-*head*
"Check out the tatties on that hammerhead!"
by TheFirstDoc September 12, 2009
when the foreskin of an uncircumcised penis is stretched forward, then twirled and folded tightly to give the penis the appearance of a hammer head shark
bogart: matt that is nasty
matt: respect the hammer head!
by crocock May 14, 2009
A penis with a very large head. Often causes bleeding and/or causing the other person to become awestruck.
'Check out that hammerhead!'

Another word meaning fucked hard.
Wow, that massive shaft is such a hammerhead!
by willie989 January 18, 2010

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