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To drop the ball on a task, or to fail entirely at an assignment. Or to have done way, way, way too much cocaine the night before.
I can't make it in to work today because I fell through the manhole cover this last night like a total bone head.

Billy! Where's my report?!?! You fell through the manhole for the last time... you're fired!
by urban1983 December 08, 2010
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