A McPee is when you go into McDonalds not to actually buy any food, but just to use the toilet.
Wait here, I'm just going for a McPee
by Rine November 30, 2003
n. The weary traveler who stops in to McDonald's to use the restroom and doesn't buy anything. Just takes a whiz and leaves. May be a lone traveler or an entire family. If more than one, "McPees."
McDonald's Employee 1: There goes another one!

McDonald's Employee 2: There goes another what?

McDonald's Employee 1: Another McPee. I mean, can't they just use the bathroom BEFORE they leave the house?
by MikenTJ March 05, 2009

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