When someone is upside-down twerking against a wall and they shit themselves so the poop drips down and covers their whole body
"Fuckkk bro I was at this party and some bitch did a Venetian Step Dance it was rawwwwwww!!! SHIT EVERYWHERE!"
from the Wall Street Journal, 1/12/07, W1: "Step dancing, or stepping, is a form of street dancing that has evolved into a cross between Ladysmith Black Mambazo and Marine Corps basic training."
"'Stomp the Yard,' which was directed by Syvain White, is absolutely fixated by step dancing." (also from the Wall Street Journal, 1/12/07)