mum and dad sandwich
When you have sex with both of someones parents and position yourself in the centre to become the filling
I'm off round martins house to have a mum and dad sandwich with his parents
Dad Sandwich
A sad sandwich made from the two crust ends of a loaf of sliced bread.
No one left me any food, but at least I can make a Dad Sandwich from what's left of that empty bag and resume contemplating suicine.