the dirty duggan is a sexual act in which the male shits on the female's (or other guy if you're gay) ass and then rubs it around with his penis. after this has been completed, the male has anal sex with the partner and ejaculates on their ass. he then rubs it around again. the dirty duggan has been completed.
I gave my girlfriend the best dirty duggan last night. It got sooo messy... i had creamed corn for dinner.
by Chin Jin Shuu-Fak February 13, 2007