someone who uses their charm to influence people into having gay sex
E.G. A gay man who just wants to fuck you
and will do anything to do so !
MAN 1. Look over there proper bum charmer !!
MAN 2. FUCK ME lets go home !!!
MAN 1. never going this pub again !
MAN 2. its the last time mate this pub is full of fucking BUM CHARMERS !!!