A perfect girl is the same as a regular girl but with equal parts sweet and dry vermouth (a martini typically uses dry vermouth and a Manhattan typically uses the sweet but the perfect Manhattan or perfect martini uses both).
Girl: I’m here. I got the vermouth but I didn’t know if you were making martinis or Manhattans so I picked up a bottle of each.
Boyfriend: Well aren’t you the perfect girl.
A very average girl who gets treated like trash and some people feel bad for her. Many garbage girls developer superiority complexes to conceal feeling of inferiority.
Guy 1: Why do you like her bro? She’s a Garbage Girl. You can do way better.
Guy 2: IDK she makes me feel like I can’t do better.