The joke hinges on how you want to interpret 'perfect arsehole'. Normally speaking, it would be an insult. However, given the context of you being regular as clockwork, it could also be interpreted as confirmation that your ****er is in perfect working order. I must say that I'm very disappointed that a self-proclaimed gigglesmith like yourself needed help with this.
P.S. I've set you up for a belter in the Ice Cream thread. It's been waiting for the punchline for over 12 hrs. Don't waste the opportunity.
