A skin irritation, typically on the back of ones neck, caused when a females unkempt pubic hair rubs repeatedly on skin.
“so during the full-moon party, we jumped into the water for naked wrestling, and this German chick left a hell of a Beaver Burn on my neck!!”
Irritation to the inside of the thighs just below the taint
that is often the result of excessive moisture produced while hiking or running in hot weather. Curable with time and lots of baby powder. Easily identifiable in others by their awkward, bowlegged stride.
I didn't finish the marathon due to a bad case of beaver burn.