A term used by military personnel to describe the threaded funnel that attaches to five gallon fuel cans which is long and resembles the shape of said animal.
a penis large enough that it could hurt someone, not only during the act of sexual intercourse, but also by slapping it across some dirty shylock's face.
"ouch, my shylock face was just thwacked by a wavering donkey dick!"
"my penis is the size of the eiffel tower...i shall name it, Sir Donkey Dick"