How do you explain it? When playing golf, each of the guys tees off, plays the fairway and finishes with a final putt. The scorekeeper then tallies everyone's score for that hole. The person with the highest (worst) score for that hole must play the entire next hole with their penis protruding from their pants. Thus, the loser of that hole is "the donger".
Man, Frank sucks at golf. He was the donger so much last week he sunburned his dick!
Sucessful completion of the sex act, but only after outrageously exhaustive efforts. Usually used to describe a rather un-satisfying sexual experience which one has been working very hard at achieving and, upon completion, does not think it was worth it.
"Lisa was playing hard to get. I had to take her out six times and spend a fortune on her to get laid, and then all she did was lay there and complain the wholetime. What a choregasm!"