A woman/girl who thinks of herself as a lesbian and will go to many lengths to prove it, though more often they show themselves to be able to be attracted to both sexes.
“Sarah, you’re a lisexual.”
lisexual: define #2
Claiming to be heterosexual, but acting otherwise; gay and closeted.
Albert has a girlfriend, but he’s Lisexual, so I think I’m going to make a move on her.