Definition of pighead:
(n) :
(slang) A foolish or stupid person.
(n) :
The head of a pin. (Frequently used in size comparisons.)
(n) :
(mycology) The immature juvenile fruiting body of a mushroom prior to its gills opening.
(n) :
(slang, pet stores) A newborn cricket used as food for pets.
(n) :
(slang, medicine) A human head that is unusually tapered or small, often due to microcephaly, or a person with that trait. Often promoted in freak shows as "human pinheads".
(n) :
(slang) A telemark skier.