1) the dance performed by someone using a wall to aid their balance when too drunk to stand on their own
2) to perform a series of sloppily uncontrolled movements, typically the flailing of limbs and other extremities while leaning on a wall, as the result of binge drinking
Jesse: "Shit... Eric's wall-dancing again..."
Jason: "Nice. I gotta see this..."
Eric: (leaning against wall) "Ayyyy.... Iiimdooonnnjussss... *mumble-mumble*... shots... *mumble-mumble*..." while spilling his drink and hiccuping...
Jason: "...Hmm... I don't think he's drunk enough. Grab the Patron"
Jesse: "He drank it all"
Jason: "Oh. That explains the wall-dance..."