Definitions by awefsvc

MBF 

An acronym for "Milky Bum Factor"

Anal perspiration caused by hot and humid conditions. Leaves one's bum feeling moist an unclean. The higher the MBF factor, the worse the milky bum feeling is.

Seriously, it is so hot & humid outside i think the MBF is at 9.5 today.

MBF by awefsvc July 14, 2010