The physical and mental fallout that follows eating anything synthesized at a McDonalds dining facility.
I don't think I can drive home, man. I'm pretty McShitfaced right now.
by TheFattestWeaboo August 4, 2011
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When someone exceeds one's own toxicity level on st. patty's day, during the "plastered mcshitfaced" stage it's rumored that one sees leprechauns and a pot of gold as well as a speaking with an Irish brogue.
I was so plastered mcshitfaced I could have sworn I saw two leprechauns doing anal on a pot of gold.
by Brandon aka Shamus O'Tool March 11, 2013
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