When something sucks really bad. Reference to Ol Dirty Bastard who has a troubled past - prison, mental facility - then changed his name to Dirt McGirt.

Referring to women who are sexually or romantically attracted to other women. Applies to both lesbians and bisexual women, as it is only the same-sex attraction that matters, not any other attractions the women may have.

Originates from the Greek poet Sappho, a bisexual woman from the Isle of Lesbos, from which we get the term lesbian.

When you're an european with an american keyboard...
You just misspelled 'dirty'