The act of shitting in a tinfoil pie container and then ejaculating on top of it, then you preferably get your mother, sister or cousin to share it.

A jack off buddy (from 'cum' /'come', meaning 'semen', and 'companion'); a friend that you get together with for sessions of solo or mutual masturbation
Variant of: cumpanion (from 'companion' & 'cum'); jack off buddy & wank bud & JO buddy
Similar to: fuck buddy

Much like the Alaskan Pipeline, one must first shit into a confom or another type of pouch. Once you thoroughly mix it with lubrication (preferably flavored) you freeze it and wait. This is when the fun starts, as you grab a close relative (parent, sibling, cousin, grandma, etc.) and forcefully fill their orifice(s) with the aforementioned sack until one or both of you shits from excitement. Hence, the Alabama Mudpie.