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10.
A person who likes to show off their pin collection on their hat or cap.
When I was at the Summer Olympics at Beijing last summer I saw at the pin trading stand a pinhead trading pins with another person.
by bigg3469 March 24, 2009
 
1.
One who lacks the intelligence of the "normal" sector of the human population; even so cannot handle the most mundane of tasks due to the lack of common sense and intelligence.
Don't screw with my computer you fucking pinhead; you'll break it!!!
by Buck May 09, 2003
 
2.
A VERY Dumb or Stupid person not capable of making educated decisions on their own or constantly making mistakes
"Why didn't Billy cash in his lottery ticket before it expired" ? Because he's a fucking "PIN HEAD" that's why !
by JerZ ICE August 26, 2007
 
3.
Lead cynobite in the horror flick Hellraiser by Clive Barker.
Pinhead will tear your soul apart.
by Nicky_M November 01, 2004
 
4.
1) a stupid person
2) the lead badass from the Hellraiser movies
1)"Ow! I said suck it don't bite it! i want my money back you fuckin pinhead!"

2)When he’s not working Pinhead’s hobbies include acupuncture, Ribiks cube, body piercing and fly fishing with the hooks he shoots out
by MrSlicko July 12, 2009
 
5.
A song written by The Ramones (specifically by Dee Dee Ramone) in 1977 on their "Leave Home" album. The lyric goes: "I don't wanna be a pinhead no more. I just met a nurse that I could go for...D-U-M-B Everyone's accusing me!" The song was inspired by the movie "Freaks" and the comic "Zippy the Pinhead." The word "pinhead," in this context, refers to an outcast/freak/childish character with a cone-shaped head.
"Jo is wearing an outfit that looks different from what everyone else in the school is wearing. What a pinhead."

"Jo's head is pretty pointy at the top. I wonder what it must be like to be a pinhead."

"Gabba Gabba Hey!" - The Ramones
by Tracy Atkins March 23, 2006
 
6.
some one who has a really small head for there body.
A)a really tall person B) a bodybuilder
by i ate all the pies June 24, 2004
 
7.
someone who is clueless and has no idea of what so ever.
pinhead) you are such a pinhead
you're dumb buddy
you're so remedial
by MICK-DOG February 08, 2014