Excessive hair on a man's back that is long enough to allow his female companion for the evening to grab hold of it during a sexual encounter, adding to her tactile pleasure and excitment.
Lulu remarked to her friends the next morning that "Leon has some serious grabbage on his back; I think I pulled out a small chunk of hair during one furious moment."
Otherwise known as grubby images.
"Eugh, www.microsoft.com has some real grabbages!"
"He did this drawing and it looked like such a grabbage."