Possibly akin to the German expression translated "shit with mustard!" It exaggerates the repugnance of shit by evoking the image of eating it. With mustard, or with onions, either expression is amusing and ... well ... distasteful.

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.