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1.
Amazingly cool people who are obsessed with Harry Potter.
Person 1: Have you got Deathly Hallows yet?

Person 2: Hell, yeah! I was at my local book shop from 7pm until Midnight on 20th July 2007 to buy it!

Person 1: 'Course, you're such a Potterhead *gazes adoringly*
de TheNargleKid 17 octobre 2009
 
2.
An extreme version of a fan of the Harry Potter books.

The extremity of a particular Potterhead's behavior can range from merely obsessing about the books by reading them more than 5 times each, and the movies by watching them more than 5 times each, to a fangirl or boy who stalks the celebrities, own a livejournal to write fanfiction, draw fanart, post self-made YouTube fanvideos, pray to shrines accordingly to their section of the fandom (eg. The Good Ship, slash, Manippers...etc), listen to Wizard rock (Wrock) and/or spend hours on a discussion forum debating on theories and opinions.

The ages of Potterheads can range from 13-80, depending on the maturity of the person. Extremists are generally older, as the Harry Potter fandom revolves largely around sex between characters, money needed to BUY Harry Potter items (that parents are unlikely to comply with), and a good sense of humor and wit to protect, again, the Potterhead's section of the fandom, as sections tend to clash (eg. Shipping Wars).

A Potterhead, however, is not a 10 year old who wears Harry Potter gear, dresses up with glasses, a cape, and a drawn on scar. A Potterhead is NOT one who thinks Ron Weasley is stupid (with exception to radical H/Hr shippers). A Potterhead is not one who does not know how to read, but watches the films and worships Emma Watson. A Potterhead is not a nerd. Nerds are too busy studying to obsess about pop culture.

A Potterhead can be closely affiliated with fangirl, fan, or Obsessed Freak of Nature.
11 year old Girl: OH EM GEE! I luV HaRrY POtTeR! It Is SoOo KeWl! RoN is So StUpId! I hAvE aLl tHe MoVieS On DvD! I dOn'T uNdErStAnD wHy Harry/Hermione DoN't GeT tOgEtHeR! DeY aRe So MeAnT 2 b In da MoViEs!

Potterhead: Go fuck yourself, you friggen peice of shit. *SQUEEE*
de burningpumpkins 24 mai 2007
 
3.
Generally someone who loves harry potter (like me) mostly amazing people that have not much to do in their lives...will know every single fact to harry potter!
Potterhead: did you know that Emma Watson is related to an accused witch (true fact..told you I am a Potterhead)
Dude: seriously...you are such a POTTERHEAD
de HARRYPOTTERRULES4LYF 14 septembre 2011
 
4.
Ugh Muggles.
Unbothered by these basic muggles who are clearly not potterheads
de steften 7 août 2012
 
5.
Some one who is obsessed with Harry Potter and the magical world he lives in. Know excessive amounts of information about Harry Potter books and movies.
Did you hear, Allie's such a Potter head she got her name in the paper when Goblet of Fire came out.
de Liesy 19 novembre 2005
 
6.
One who is freakishly obsessed with Harry Potter. While particularly fond of all children's movies, Potter-heads are so obsessed with Harry Potter that they have trouble holding jobs which require more than 30 hours per week, and they typically:

- own every Harry Potter book and movie,

- dress in costume to attend the premier midnight showing of new Potter movies, and

- never miss the annual Comic Con Convention in San Diego (typically late July to early August).
Example

Kris: Is that Shanley dressed up as Dumbledore?

Devon: Yeah, she's such a Potter-head.
de itsfunnybecauseitstrue 13 juillet 2011
 
7.
The best fandom in the world.
Potterheads - Someone incredibly proud to be apart of the Harry Potter Generation and have stuck with Harry Until The Very End.
de Potter123 12 août 2011