When a rash appears on your legs causing irritation and itchyness after a sexual experience(s) which can only be put down to aids, for lack of knowledge on sti's
Freddy - "WHY IS THERE A RED SPOTTY RASH ALL OVER MY LEGS?"
George - "Who have you been sleeping with?"
Freddy - "Elton. I doubt its an std! they dont cause leg rash!"
George - "Yeah they do, you have laidsh!"