A cute girl or guy whose sole redeeming quality is that they look good on your arm, next to you.

A nice symbiotic relationship - they get to be seen with somebody as cool as you, and you get to decorate your arm for a while. No actual emotions are usually involved. Hopefully not, anyway.

If the arm jewelry in question turns out to have more to him (her) than a pretty face, then they transcend the moniker to become a real person.

Compare with fish; no sex is implied by the term "arm jewelry".

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