What about 'bunce nodger'?
I know it doesn't really mean anything, but it sounds a bit rude, right?
( Two Hats 🎩🎩, Wed 29 Jan 2014, 10:19, archived)

See also: Tit Pipe and Dick Noise

( Two Hats 🎩🎩, Wed 29 Jan 2014, 10:19, archived)

and
en.wikipedia.org/wiki/Rambling_Syd_Rumpo
( vladimir The Days Pass Quickly Immersed in the Shadow of Et, Wed 29 Jan 2014, 10:27, archived)