as in "takin' the Stairwell Tour". To become so crunk you make insane assumptions like the hotel doesn't have an elevator (because you can't locate it) so you take the stairwell as the only option.
Sheila: "Dude, where's Amy? We came into the lobby together but I can't find her now!"
Rob: "Well, she tried to get on top of the table at the bar, so...prolly took the Stairwell Tour."
Or "Better check it Willis or you're gonna be takin' the Stairwell Your."