a form of sex in which the penis is inserted into the vagina(doggy style fasion), then pulled from the vagina and inserted in the anus. Then pulled from the anus and put in the vagina once again. This process is repeated at double the rate of average humping in order to simulate sex in both areas at the same time, aka double penetration.
Bob and Mary had anuginal sex and now Mary has a vaginal hemerrhoid!
by j stim August 11, 2004