Absurd stunt involving David Blaine hanging upside-down above a NYC ice-rink for a couple of minutes, duly extended to mean any publicity-grabbing gig exposing the protagonist as a complete "twatdangle".
From Old English "Twattendang", from the Viking "Twtdnglersk", meaning to hang from the rigging of a longship in an attempt to impress your shipmates.
"Hey, did you see the upside-down David Blain thing? That was like so cool."
"Nah, the guy came down after two minutes for a piss. It was a total twatdangle."
A trip to a grocery store, convenience store, or gas station for the sole purpose of buying an excessive amount of junk food and sugary drinks, usually with friends. A chud run often happens late at night and ends with everyone involved hating themselves afterwards.