lunchtime girlfriend

The chick you often have lunch with at school. And nope, she's not into you. She just happens to be stuck in the same class as you do.

Barney: I have like 5 lunchtime girlfriends.
Kim: Wtf? Are they blind?
Barney: No they have the same ENG101 as me and the class is off at 12:30. I tried asking them out on weekends, they just told me to f*** off.