The act of pressing one's penis against a window. The slightly flattened penis gives those on the other side of the window a visual of a "dead rat". This act is particularly entertaining while walking by a bar with floor to ceiling windows on a busy weekend evening.

Somebody who do anything the day, everyday. antisocial but friendly. Deadrat is not an insult.

when a male sticks his penis in between his legs and bends over to show the "rat" in his ass. a backwards mangina.

A used Tampon.