A girl who is open all the time. Who open 24/7/365.
"Dude i am so horny,"
"I know this chick who is a 711 girl"
1. a girl who is open to anything.
2. a girl who is easy , meaning a girl of convenience, a 1-nighter, a nightcap in a skirt, open like 7-11.
I had a late-night craving for a 711 girl, and it was open all night.