The Bog is the area between the genitalia (usually
male) and the asshole. This area is also known as the
Taint but when it is particularly
sweaty, slimy or not clean it is referred to as "the bog".
After having sloppy
sex all night and then going for a jog.
Kenny declared, "Man, my bog is sweaty."
Alan had a sweaty bog because he refused to
shower for a week.