Sandwich Girl

I am down in DC showing my aggravation during the inauguration. While in the streets I heard two guys describing a girl they met as a "sandwich girl".

I thought it was a girl who worked at a hero shop like a Blimpie's or Subway but the phrase is used to describe someone who is very thin, someone who needs a sandwich.

What's a 'hero shop'?

DFG

A place where they sell hero sandwiches.
hero AKA hoagie AKA sub AKA grinder

Oh, all is now clear! (eh?)

DFG