a stupid or incompetent person.

"allow it" means to just leave something alone, or don't worry about it. People in West London say this quite often.

A person who is heavily intoxicated to the point that his/her eyes deviate away from their head (much like how a hammerhead shark is)

Another word for penis you can say in public

(n.) One who is slow in grasping an idea or concept. One who talks the talk but cannot walk the coroporate walk. An albatross around the neck of any company, quite likely to scare away the customers. Hammerheads are often killed in road accidents.

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.

Hammer head is someone who uses heroin and shoots up a lot, or likes to chase the dragon.