the mad donkey
when a guy is nailing a girl from behind, and as he's about to blow his load, he punches the girl on the back of the head, causeing her to 'BUCKAROO' and creates great orgasms all round.
Hey Brad, I nailed that chick from the bar last night. We had some amazing sex, I managed to slip in the mad donkey. I don't think she was expecting that.
Mad donkey shit
Said to someone who is trash and literally dog water at the said activity the person is part-taking in.
Damn, son why can’t you walk, you mad donkey shit.