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An individual who performs less than satisfactorily to the chagrin and sometimes amusement of his or her associates, crew, or squadron.
The preflight crew forgot to leave water bottles on the jet for us? What a bunch of crumplesacks!
by Commander Crumplestiltskin February 25, 2017
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2
someone who goes beyond the margin of failure
jesus- look dad i created cancer- also known as michael

god- son you crumplesack
by leleleleelelelel April 08, 2017
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