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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.
pinhead by BruinKiller3469 March 24, 2009
A pinhead is someone who comes from the north of Devon, England, who scrounges off everyone and has no survival instincts.
Look at that pinhead! He needs to sort his life out!
Pinhead by Trixey Smith August 10, 2009
Old slang term for pinstripers, practitioners of the old art of pinstriping.

Pinstriping is most often practiced and painted upon hot rods and motorcycles, Pinheads however paint pinstripes on anything they think will look cool with pinstripes, such as Zippo Lighters, coffee cans, old whiskey bottles, and the namesake piece of art, bowling pins (Cool huh?)

Pinheads often gather together and participate in Panel Jams, where Pinheads bring their stripe box and some Plexiglas to pinstripe works of art and trade with their fellow stripers. One of the more well known ones takes place in the middle of March called the Ratfink Reunion, which is located in Manti, UT every year.

Some of the more well known Pinheads include (but are not limited to!) Herb "The Line Doctor" Martinez (arguably the most well known pinhead), Tommy "The Greek" Hrones, Dean Jeffries, Steve Kafka, Von Dutch, Hot Rod, Morkel Snorkel, Tommy "Itchy" Otis, Peter "Preacher" McDermott, Bob Spena (Apprentice to Von Dutch), John Kosmoski (Founder of House of Kolor), Craig Frasier (Inventor of the Slash Stripe), Enamel, Bobbo Dunn (Innovator of the curly type pinstriping technique), Willis Dormer, Jimmy C., Coop, and the Legendary Beam Brothers (Innovators of the Fresno Stripe).

It is unknown who coined the term, though it is agreed that it first appeared in the mid 70's.
Hey guys, did you see all those pinheads at the rod show last night?

Hey Jason, you're a pinhead right? They're having a panel jam downtown at the shop tonight.
A person who smokes weed but only hits a dab pen. This is usually the result of strict parenting.
Yo does a Olivia smoke gas?

Yes but also no, she’s a Pinhead I’m trying to get her on the good good.
Pinhead by Niyninski January 3, 2021
Sixties expression of drug purity, most specifically methadrine.
Easy on that line Bro. This is pinhead.
pinhead by Larry G January 4, 2005
When you stick a pin through the end of a joint so that you can finish the last little bit - that is a pinhead.
I don't have a roach clip - "That's ok, we'll just make a pinhead".

In the song "Down on the Corner", by CCR, many people think there are drug references in the misunderstood lyrics "You don't need a pinhead, just to hang around, but if you've got a nickel won't you lay your money down".
pinhead by C00per December 20, 2007