Noun - typically an old magazine or newspaper that is placed between one's feet and the surface of a coffee table so that the oils and perspiration from the skin of one's feet do not tarnish the surface of afformentioned coffee table as said person uses said coffee table as a foot rest.
Yo dude! Why are you using the sports page as a foot coaster?! I was still reading that.
Hey bro...hand me your sister's copy of Cosmo to use as a foot coaster.