Generally used as a sex move where the penis is so inflamed it can be used as a meat mallet, to excessively pound ones anus.
Alex- "Did you see sara get taken out with the Norwegian Donk Slapper?"
Chris- "No, I bet it was gross..."
Alex- "Dude, as soon as he slapped her donk his dream cream blew across the room! It was epic!"
Chris- "I wish I was there.."