adj upper-class. Your aunt Mabel might be posh because she lives in a large country house, or your dad’s new Mercedes might have seemed a little bit too posh for him. It’s not rude, but it’s not really particularly complimentary either. The term probably comes from the Romani word, “posh”, meaning “half” (and used to refer to half a crown, a substantial sum of money at one point). posh wank masturbation performed whilst wearing a condom (male-specific, one would imagine).