This is when a man and a woman, after enjoying some Rice-A-Roni—the original San Francisco treat—engage in a "69". The man proceeds to puke into the woman's vaginal orifice, and since she is from S.F., she is probably pretty hairy. Thus, the rejected Rice-A-Roni and the hair pie create a special sort of soufflé a third party (who has been watching or filming the 69) can then enjoy for her or his own pleasure.
by SolFrank November 24, 2014