What is Undie Grundie?
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The act of inserting a finger or thumb into an unsuspecting victims anus through their fresh new underwear, thus causing a permanent poo stain. If done in a forceful manner, blood stains may accompany the poo stains.
Paul surprised Steve with an undie grundie...a large fight insued.
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See: GENIUS
The mastermind behind the 2004 World Champion Boston Red Sox!!
Theo Epstein is only in his early 30's and has already..