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
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
when a man is inappropriate with a woman during sex (shits on her, punches her, hits her, etc.), and the disgruntled woman whips out a hammer and smacks him in the fucking face until he is dead. then she takes his money and runs away. then she blames it on self defense, or just has sex with the policemen to get away with it.
tenzin tried to give me an alabama hotpocket, so i took out my trusty hammer and hammerheaded his sorry ass. now he is dead. muahahaha.
by lhamo_is_zema December 07, 2009