MacDump 

The act of taking a crap in a convenient MacDonalds toilet, with or without purchasing food, whilst en route to any venue likely to have either no toilet or one so foul you would prefer to avoid using it.

On arriving at a music festival: "I stopped off on the way for a MacDump as the toilets here will be knee deep by now."

I'm going to take a MacDump while I'm here, Steve's bathroom is freezing.

MacDump by Firkit December 14, 2008

McDumpster's 

A more accurate depiction of the fast "food" chain commonly known as McDonald's. Name derived from the classic Mad TV skit from the series' very first episode in 1995.

I had severe food poisoning and an explosive case of diarrhea after eating at McDumpster's.

McDumpster's by DirkD January 21, 2007

McDump 

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!"

McDump by master gas blaster January 3, 2003

McDump 

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

McDump by ManWhore89 April 9, 2015

McDump 

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.

McDump by Mr Sleep July 26, 2007

McDumped

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

McDumped by TrueDeathMetal/DeathcoreFan August 3, 2009

Poopy McDump-Dump 

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!"

Poopy McDump-Dump by Shnurf Shnurf Bagribbles August 4, 2009