The Mangroomer

[fatsack]

The Essential Do-it-yourself back shaver.

http://www.mangroomer.com/

from their FAQ section:

avoid Embarrassing Moments Intimately – Sexual partners find it hard to tell their partner to do something about their back hair and may be turned off having to shave, wax or apply smelly chemicals to help remove it. MANGROOMER will solve this problem. Give it as a gift!

[Viva Las Espuelas]

All i've got is just "WOW"

I'm sure that could handle the ass crack.