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1.
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.
by do'er March 15, 2011
 
2.
Hot females of the Scottish persuasion.
There's plenty McPoon here in Edinburgh.
by Dirty Daz-D June 28, 2006