I try not to use it when there are chicks around that get offended by it but I know a lot who don't really care.
I use it pretty commonly though like 'haha you funny merkin' or 'ohh u dirty merkin' etc
Obviously wouldn't use the word at work
I met this english girl last year, she was really cute and had a half posh/half northern accent, was very funny (and endearing) when she sort of whispered "he's such a merkin" about a lecturerThe funniest thing is when chicks do it, not the bogan chicks, but chicks who are brought up to be all elegant and shit.