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1.
An act (past tense) of being a dumbass.
It was major dumbassedness on Jim's part when he robbed the bank in broad daylight.
by John February 17, 2004
 
2.
This is the condition some people have, who are ignornat beyond what should be allowed by law.
So many times we let other peoples dumbassedness rule our happiness.
by CrystalF March 31, 2010