An epic, and even violent doody event (anal explosion), after the consumption of McDonald's, or "Mickey Ds". It usually happens 1/2 hour to an hour after indulging in the omni-present Scottish cuisine. It gives no warning, and may render an unsuspecting individual with a STANK- ASS, and messy drawers! Big Macs are notorious for such an event.
Yo son, I just took the most stank-ass McDump after eating two quarter pounders, fries, a shake, and an apple pie. It was nasty yo, and cleared out the public restroom!"
by master gas blaster January 4, 2003
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Taking a shit in McDonalds and then just leaving it.
Dude, we've really got to go, I just took a fucking huge McDump and now the toilets backed up, there's crap everywhere and people are crying
by ManWhore89 April 9, 2015
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The unpleasant bowel movement that occurs within an hour of eating at a certain fast food restaurant. Most food takes roughly 4 hours to digest, but this biological puzzler takes less than an hour.
Just like clockwork, I had to take a McDump 15 minutes after I left the restaurant.
by Mr Sleep June 24, 2007
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When a guy/girl chooses to break up with their girlfriend/boyfriend while in a crappy fast food restaurant.
This usually occurs after a bad fight when the dump occurs it is customary for the dumper to stand up and shout

You have been McDumped!!!!
Kelly: Did you hear that Sharon was McDumped by John?

Joe: ha serves her right she was a bitch
by TrueDeathMetal/DeathcoreFan August 3, 2009
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This would be said when someone is trying to say something, but can't think of the word and inadvertently says this instead.
"Remember, it was at the, aw poopy mcdump-dump!"
by Shnurf Shnurf Bagribbles August 4, 2009
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The true author of Sun tzu's art of war. Also invented the boston steamer however that was earlier in his career and he did not take credit, claiming the inspiration came from his name. Sun Tzu was a peasant he paid to put his name on the book so it would sell better, unfortunately while it made him rich this move allowed history to forget him.
"Hi my name is Big Fag McDump-on-ma-chest"

"Oh"
by Gerdemann25 August 2, 2007
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