some body who loves to give anal sex.
After a romantic meal for two Boatyard John likes to mash Richard Newmans dinner for him via his asshole. He is a great big dinner masher.
by JPH November 27, 2003
A male homosexual. Slang for a faggot.
A group of UK soccer players on vacation in the US discovered that the beach they were on was a GAY beach. "Look at this Clive. The bloody place is crawling with dinnermashers!"
by Bill Alphonso's Dentist August 11, 2007