donkular ding dong Share definition Flag A man's penis, when flaccid, that is more than twice the size of most men's erect ones. I've never had gay tendencies, but this guy next to me at the urinal whipped out a donkular ding dong and I got dizzy. donkular ding dong by peepee envy October 18, 2010 Get the donkular ding dong mug.