When a man creates a seal between his asshole and a woman's vagina. He then shits into the woman's vagina. Once the vagina is filled with shit he proceeds to fuck it until he makes a creampie. Thus you get a nice fluffy hot pocket.
Alternatively a turkey baster filled with shit may be used if you can't create a proper seal.
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi