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A girl who you really want to sleep with but afterwards feel sort of depressed that you did. Normally requires vomiting or a gym session to clear your mind. Very similar to the feeling you get after you eat McDonalds.
Bro 1: last night i totally did some mcpoon, want to hit the gym after class so i can get over it?
Bro 2: sure bro, i normally vomit to get over mcpoon, you should try it.
mcpoon by do'er April 1, 2011
Related Words

Slowy McPoopson 

A person that takes a long time in the bathroom. (Most likely because they are defecating)
I have to use the bathroom. I hope Slowy McPoopson isn't in there.
Slowy McPoopson by Matt Savo December 30, 2008
McPoops are the shits you take right after eating McDonalds. One usually gets the McPoops after eating a McDonalds item that doesn't agree with you or after eatig healthy food for awhile and then going back to McDonalds.
I had the McPoops for a day after that BigMac.
McPoops by Phil B. May 11, 2006
The dirtiest nasies cheapest porn on the net
Man this Mcporn is the shizney
Mcporn by DJeck April 22, 2008
Fred ate 5 McMuffins and then took a McPoop at Mcdonalds yesterday.
McPoop by TahoeBob June 2, 2008
1.McPoo
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
McPoo by Andy Burns January 24, 2005