A loser lesbian.
A lesbian who just CAN'T seem to get laid, or get a date, or find a lover. Chicks always escape her.
Alice: Mmm...You'd think being a lesbian, it'd get you some vag!
Jess: I guess I'm not a true lesbian then...I must be a losebian. =(
Lucy (a lesbian): What the FUCK!?
I just got rejected by that girl...
Liz: Girl, I hate to break it to ya...but you're a losebian. =/