Undie Grundie

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.

See underwear, undy, undie, grundie, grundy, undies, grundle
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