A Bestbian is a hybrid word that derives from the words, best friends & lesbians.
In some cases it can be lesbians who are also best friends, or 2 female friends that get confused for lesbians, a lesbian who is your best friend, best friends that are both lesbians but not for each other, or best friends with lesbian tendencies. Or many other variations of best friends AND Lesbians.
Example1:
Guy-"Are those girls holding handslesbians?"
Guy B- "No I think they're just Bestbians"
Example2:
Girl- "This girl right here, she is my best lesbian friend!"
Girl 2- " You mean your Bestbian?"
A pair of heterosexual girls who are really close friends. They are inseparable and may have serious future plans that include each other, such as rooming together in college/living together, and/or owning a bunch of cats together. The living situation is very similar to a Boston Marriage minus the lesbian aspect.
Bestbians are the female equivalent of a bromance.
-Katie ditched her boyfriend to help her bestbian paint her room.