In Arabic, "2u5t" can be used euphemistically to refer to a woman, especially in religious language. So "an important sister" can simply mean "an important woman." We sometimes use "2u5taah" ("O' sister"), which incorporates an archaic vocative suffix, to mock the pretentious register of Arabic and the obsession with women's behaviour that ultra-religious Muslims sometimes show. احذري الإيدز يا أختاه ("Beware AIDS O' sister") is a facebook page about sexual health directed towards the gay community, using the term to ironically refer to a male homosexual in this case, rather than an actual woman.