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1.
An abbreviation for the word(s) super duper.
Dude we are getting sduper stoned tonight.
by Magic Ass Maufaka September 22, 2010
 
2.
A combination of the words "super" and "super", a shorter and less stupid sounding way of saying "super duper."
"Marie, that haircut looks sduper good on you!"
"Why thank you, you are a sduper good friend."
by NeenaS April 08, 2011