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When you roll a snoring or knocked-out person onto a skateboard and slam them under someone squatting, while that someone lets out a bunch of tiny, wet, smelly poops on them. You need at least three poops for it to be a 'series', otherwise it's just a 'meaty beneathy'.
I woke up on a skateboard under my uncle as he pooped like a frog on a trampoline.
My friend got launched under my aunt during a lunchtime pooping spree.
I was on a skateboard under my dad as he pooped like a madman.