The act taking a shit in ones mouth and proceeding to face fuck it.
Chris took a hot steamy shit in Shirley's mouth and then fucked her face. The Michigan Lean Pocket was thought up by three bowling alley workers on a league night while thinking of what to do to some of the bitchy league members
Similar to an Alabama Hot Pocket where one deficates into a vagina, using the fecal matter as a lubricant. However, in the case of an Alabama LEAN Pocket, it is where a person shits in his own hand then masturbating. Often practiced by the desperatley lonely.
Alex: (Through sobs) I'm so lonely... I think it's time for an ALABAMA LEAN POCKET. (Proceeds to poop in his hands)