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4.
As a state of being after use of very potent marijuana.

Being "super duper high", but being too high to say the entire phrase.
No Sarah, I can't come in to work today, I'm duper.
by Herro dere... February 02, 2011
 
1.
when something is better then super its duper
Hey Banard that sandwich was duper good.
by Joe Grande February 27, 2004
 
2.
wholesome, wonderful, well practiced
Super duper child!
by SAJUsuperdupercousins April 03, 2011
 
3.
one who is not the brightest bulb in the tanning bed.
oftenly compaired to "a retard"
shut up!! you sound like a duper!!
by mcshmenna April 28, 2008