When Something doesn't work out, or happen.
My friend won-jun I were suppose to go to a party.
Zack "why didn't you guys go to the party"
Mike "it fell through"
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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!