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1.
A clumsy or silly person.

One who is acting silly or in a ridiculous manner.

Bufoon, oaf, or otherwise worthy of ridicule.
Stop sliding down the bannister, Stupenagel, you're going to fall off and make the chicks laugh!
by kintatsu April 28, 2009
 
2.
A word originating in the 60s. Currently translated as Dumbass, or dipshit. A clueless person or dimwit.
"Take the lens cap off the camera first, stupenagel"
by melliemoo March 15, 2009