This acronym stands for "Withdraw from cock". This also happens to be why a woman bleeds for seven days without dying. The woman is so cock deprived, that as much as her VAG wants cock, it starts to bleed because it hasn't had any. In short WFC is just another way of replacing that awful acronym of PMS.
Kenny, what's the 'tude for bro. Oh, I understand! Guys it's alright, he just has WFC.
-Oh, okay then, that's reasonable.