An 'A-Double Dollar Sign' is just that. An 'A' and two dollar signs: A$$

Used in reference to the female buttocks, usually in an appreciative manner.

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.