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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
Supdate takes the formerly shortened word 'sup' which is derived from the question:' what is up?' and combines it with update, which simply molds together the two following phrases: 'What is up?' and " i want to hear an update regarding your life and recent endeavors."
It can be used in several of the following fashions, "Hey Dude, supdate?" Meaning hello friend, what is up and please give me an update on your life.

Or, "Hey dawg, supdate?" meaning- hello cool guy, what is up and please give me an update on life.
Supden is a short hand slang for saying "whats up then"
"You wanna fight, supden?"
Supden by Daleoner November 9, 2009

SupDogger 

This is a term to define someone who is just goated and cracked at life. Or you're just a cool dude. If someone calls you SupDogger, consider yourself lucky.
Yo lets play some patty cake SupDogger.
a combination of sup and dude that sounds a lot like the word subdue and is meant to sort of subdue the perhaps heightened energy of another to get that person in a calmer and/or more humble state
person A: supdooo
person B: hey man hows it going? Idk why but I suddenly feel more chill for some reason – did you just cast a spell on me or something?
supdooo by shaggymorphism November 18, 2021
meaningwassuplike “hi” “hey” “wyd”
me: supdoee
Nba youngboy: “nun much, wsp?”
supdoee by anonymous June 24, 2022