I don't know where they got the word but, "quaffing" was HUGE with my daughters friends during highschool. Unfortunately, vulgarity will always be "in". My best friend in the 70's like to call guys scrotum face. My apologies to the sensitive among us. A bizarre application of the word scrotum but my point is that the sensational, no matter what the word is, will always have an audience and applications most people would never imagine.
I think the word "wench" will always be around because I think alot of men like to say it and like what it represents in their own minds. I think it's left over from the Neanderthal period.
Does it have anything to do with the word "queef"? As in, looking for a word that sounds like it, they came across quaff? The whole arse-ass shift.