What is Undie Grundie?
1.
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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The best game in the world. Some stupid ninja moves include "Aiee!" "sonic BOOM!" "Uma Thurman!" "Man..
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The state of being while and after puking due to excess drinking or smoking
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Has two meanings, depending on context:
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