A series of meaty beneathies
You drag a knocked-out person onto a skateboard and crash them under someone who’s doing a bunch of quick, wet poops. If there are at least three poops, it’s a 'series', if not, it’s just a 'meaty beneathy'.
My dad pooped on me three times while I was under him on a skateboard.
I got smashed under my sister as she pooped like a robot on three separate occasions.
My cousin pooped three times on me while I was on a skateboard under her.