Top Definition
an event caused by a poorly rolled hash joint exploding at an inopportune time which results in burning hash embers falling on the felt of your poker table causing great damage, followed by laughter.
Poker player one passed the poorly rolled hash joint to poker player two and the motion caused a hashtastrophe!
Wow, this table looks like it as survived a few hashtastrophe's.
Roll that better, so we avoid a hashtastrophe.
by RiverUagain October 26, 2013

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