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Supdawg is an American slang greeting. It is a heavily corrupted contraction of the properly phrased question "What is up, Dog?". It's genesis is rooted in the American inner city neighborhoods of the 1980s where it has fluorished in the Hip Hop music subculture. It is notably in extremely heavy usage in the West Loop area of downtown Chicago centering on the intersection of Clinton and Van Buren streets.
Example 1
Person 1: Supdawg!
Person 2: Supdawg!

Example 2
Person 1: Supdawg?
Person 2: Nothin'
supdawg by Supdawg November 22, 2004
Related Words
This term originated on www.supraforums.com as a strange slang for the Toyota Supra turbo. Typically, a "Supdawg" is of the 1994 or newer model.
"Damn, you just got smoked by the supdawg!"

"Tonight we're taking Johnny's mustang out and we're gonna hunt us some supdawgs!"
Supdawg by Jason AKA Huggles May 25, 2004

Sundagers 

When a grouping of young professionals choose to get unnecessarily intoxicated throughout the day on a Sunday.
Maureen : "HEY LAUR YOU WANNA BE Sundagers THIS WEEKEND?!"
Lauren: "Hell yea Moe! I'm already in line at STATS!"
Maureen: " Ok , sweet, order me a budlight and an espresso martini plz"