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
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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 5, 2009
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As with Mcpee this is when you go into McDonalds not to actually buy any food, but just to use the toilet. However, when confronted by the overzealous 5 star employee stating toilets are for customers only, you lie and say you're buying food after you've been.

Johnnie 5 stars: "Excuse me, toilets are for customers only!"

Desperate passer by: "I'll be right back for a Big Mac, but my back teeth are floating and you don't want me to piss on your floor now, do you?" The Mcpee with lies.
by dover_pro October 17, 2007
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jaylen: addy mcpee is so hot that’s why she’s my bf
by grabs boob aggressively April 1, 2021
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