During the act of intercourse (Homo or Hetro) the bum(fanny) moves backwards and forward at high speed! Just like Nigel Kennedy's elbow!
On New Year's Eve Paul's arse was going like a fiddlers elbow when we caught him knobbing that fat lass!
If a person, man or women, has a sore wrist from masterbating to much.
Fo goodness sakes Mark why cannot you pick up that carton of milk, I'm really sorry I've got fiddlers elbow from that catalogue, the boobs just took it to anoher level...