I'm the shit like a fully-functioning somersaulting porta-potty

from Wale – Skool Daze Lyrics on Rap Genius

Meaning

Since porta-potties aren’t connected to any drains, a somersaulting one would be spreading shit everywhere. There’s a scene in the movie Eight Crazy Nights that features this.

https://www.youtube.com/watch?feature=player_detailpage&v=ngZbxdRqIvU#t=29s

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