The name nearest piece of material available for wiping off the baby gravy from passionate moments past. This could be a towel, tissue, a sock or even an animals head. We all have potential spunk dusters around us, it is the act of wiping your mess on it which will forever cement that items name as the "Spunk duster"
Guy: Ohhh yeah, that's got it! Here it comes!
Gal: Watch out for my glasses!
Guy: It's safe, it landed in your armpit....
Gal: Ok, pass me the spunk duster...........