Footnapkin

Footnapkin [foot*nap-kin]
-noun

1.  a nonsensical word for a cleaning device for ones foot.
         Please use the footnapkin before you come inside.

2.  a very logical description of the use of ones foot to "clean" up spilt milk.
       "Look, Mommy!  Hudson's clenaing up the milk with his footnapkin."

Lovely.