fanshirt

[Landau, James]

I saw someone wearing a T-shirt saying "My guitar is a horcrux".

(a horcrux is an extremely nefarious entity in the Harry Potter series,
introduced in book 6 although one appears in book 2)

I asked my daughter about it and she e-mailed back:

>"My guitar is a horcrux" is a fanshirt for "Harry and the Potters",
whom
>I saw this past March...link here:
>http://www.eskimolabs.com/hp/ 

Although T-shirts bearing the name/logo of a fan's favorite whatever
have been around since before some golfer came up with that visual
eggcorn "tee shirt", I have never before encountered "fanshirt".

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The American Dialect Society - http://www.americandialect.org