In Melbourne last summer we ran into the fascinating layers of rhyming slang, day after day. Of course in Australia as far as I could tell every word of two syllables or less is used to refer to alcohol or sexual activity or both.
A personal favorite was a Wellie, as in "How about a Wellie?"
Wellie=Wellington=boot, rhymes with root, term for sexual intercourse for reasons I do not even want to contemplate.
So of course when a friend wrote from Ireland, where I was heading for a visit in Feb, "Don't forget your wellies," the possible responses were extensive.