conehead

noun6

1. •
   (slang) A pinhead, a stupid person.
2. •
   A foam rubber rounded cone hat to be worn atop the head as a costume to appear to have a conical bald skull.
3. •
   An insect of the katydid subfamily Conocephalinae.
4. •
   (informal) A person who has undergone cranial modification in order to produce an elongated skull.
5. •
   (Australia, slang) A person addicted to smoking marijuana with a bong.
6. •
   Any member of the order Protura of insect-like arthropods.

noun2

1. •
   One of a fictional race of humanoid aliens with conical skulls.
2. •
   (slang) A fan of baseball pitcher David Cone.