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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'
by Supdawg November 22, 2004
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Nov 27 Word of the Day
A stupid person; it refers to the lack of surface area on an individual's brain. The general thought is that the more surface area (wrinkles, creases, etc.) a brain has, the smarter the person is. Conversely, a person with a smooth brain (no wrinkles) has less surface area and would therefore be stupid.
That fucking smooth brain put his shirt on backwards again...

That smooth brain is dumber than a pile of shit.
by Tip Tank May 14, 2011
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2
A commonly used phrase by friduwulf during Rust gameplay to express his excitement when gumby logs on to team up and farm the fuckin shit out of some nodes and PVP the fuck out of some squeakers and door campers.
*gumby runs up to fridus base on the map*

Friduwulf: “Sup dawg
by ZENKIGANG May 24, 2019
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3
A combination of the words sup and dawg to sound cool when talking to someone at the beginning of a conversation
A- "Yo sup dawg."
B- "Get that large black hairy dick out of your mouth!"
by blahblah1234432 December 11, 2010
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4
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!"
by Jason AKA Huggles May 25, 2004
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