The Trendy Lesbian will discuss, with her Trendy Lesbian friends, how uncool it is to be straight, and how edgy it is to be "sexually attracted" to other females, and that is what makes them superior and individual.
When conversing with a straight female, the Trendy Lesbian will openly mock the practice that is a heterosexual relationship, and ask her friends such things as "Would you sleep with a man? I wouldn't sleep with a guy. I just think that it's weird and un-edgy." while the straight female wonders why she even allowed herself to respond to the Trendy Lesbian in the first place.
The Trendy Lesbian has more often than not, never slept with another female, and will stretch to kissing one at a party to keep her reputation as a "lesbian" untouched. The Trendy Lesbian has more often than not, never slept with a male and uses her "homosexuality" as an excuse for being ugly/unloved/oppressed by her parents/ignored at school etc.
Trendy Lesbians travel in packs, and will have an extended Trendy Lesbian network consisting of a large number of other Trendy Lesbians. They will meet up occasionally to moan about how there are no other Lesbians in their area, despite there being a large group of them sat together, who could in theory, just sleep with each other if they were really all that bothered.