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
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
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
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.

WARNING:
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
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 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

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