Disk of Dough.
Originated from the novel "The Disreputable History of Frankie Landau Banks" by E. Lockhart. It refers to pizza, but the kind of crappy pizza you get anywhere but New York.
-"Dude, I want some pizza"
-"Nah bra, you can't call the crap here 'pizza'"
-"What should I call it then?"
-"A disk of dough. A D.O.D. It doesn'tdeserve the honored title of 'pizza'"
When a woman does want a full relationship but wants consistent sex. She wants dick on demand or D.O.D. She wants a man she can call and he will be right there to give her what she wants.