1 definition by boom&bewm

The act of running to the nearest toilet before expelling your bowels in your pants in public after ingesting McDonald's 15 mins prior.
John: Oh boy, stomach cramps it's happening!!
Alex: The McRun!! Run man, run! You have less than 15!
John: Help me God!!!!
Alex: God bless that man, for the unspeakable horrors that come after.
by boom&bewm October 21, 2014
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