Acting like a complete asshole. Some examples of 'Suplering' are taking your pants off in public, shaving a mankini (hair bikini) on your chest, sending body or facial hair by mail to your friends, wearing a horse or unicorn head while doing regular life activities, constantly says things like, "let's get weird", "stop being poor", "Well, this doesn't suck", "you jerks", & "this is a horrible time".
Man: Hey, did you see that guy take his pants off, chug a beer, and call those people jerks?
Other Man: Yeah, he is totally Suplering, fucking asshole
The act of bingeing on food right before you go on a major diet, in an effort to eat all of your favoritejunk food before swearing off of it for a while.
Kelly: "Um, are you really going to eat that entire bag of Doritos? And what happenend to the box of Krispie Kremes I just bought?"
Mark: "Sorry, I start the South Beach diet tomorrow- just doing a little last suppering."