Women under 25 ID themselves as a lot of goofy things, and have for centuries.
In this case it is likely cases of LUGs (lesbians until graduation)or “bisexual” just to make them more “attractive” to dude-bros and pervy old men.
The would be Faggot Until Graduation...FUG.
But, that could also mean Fat Until Graduation.
I was a DUG.