a frog that has been run over by so many cars that it's flat. You can pick it up and throw it like a Frisbee and it will sail.

(1) A frog or toad that has been run over on a highway, resulting in a dehydrated, absolutely flat corpse.

(2) An item of many creative uses, can be used as a frisbie, bookmark, mousepad, or for use in mailing prank letters.