"Um... Did u srsly not kno dat?"

Usage examples of duh.

And in less time than it takes to say "Operation Rescue," Fred had Ma, Duh, men, women, Lin-Say, Jos-Feen, Sam, and me on one side of the boulder.

He took us all out dis mornin' an' stood us to duh bigges' dinner in town.

All I pays attention to is duh ball from duh time it gets to about two meters away from me.