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1.
Butje is a Dutch invective meaning a stupid (dumb) person.

Butje is also the name of a Dutch song by the Huilende Rappers (crying rappers)

nl.wikipedia.org/wiki/Butje
''Ben je butje ofzo?'' (What are you stupid?)
by Butje! April 17, 2010
 
2.
What you are
"Are you butje?"
"Are you a little bit butje?"
by Sjaakie3 February 25, 2009