Top Definition
a bowel movement taken after consuming
food from a MCDonald's fast food establishment
Man, after eating that happy meal I took
a really forceful McPoo
by Andy Burns January 24, 2005
(n.) 1. A person, action, or behavior that is beyond explanation; also "to pull a McPoo" (see example 1)

2. A very quirky, strange, or bizzare person who is difficult to read. (see example 2)
1) "When I told Bill he had just screwed the pooch, I never thought that he would actually do it. What a McPoo!" or "I never expected Bill to do that; he really pulled a McPoo when he screwed the pooch."

2)"Bill majored in drama in college, has feminine tendencies, and acts ambiguously gay. However, he has had a girlfriend for two years to whom he recently became engaged. I don't understand this guy; he is a real McPoo."
by no porking in rear September 30, 2004
noun - a poo you have in McDonald's free toilets at the start of a night out, in order to avoid the rancid nightclub toilets that will be your only option later in the night.
"Tony, you fancy going for a McPoo before we meet everyone?"
"Yes. Yes I do"
by 2hasmat March 03, 2014

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