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Licking a person's asshole and surrounding area. Derives it name from it's similar taste to an American 20 dollar bill.
As Cynthia lay on the bed, she felt Marcus slowly move where the focus of his tongue was located. Oh wow, now he's really licking twenty she thought.

"OH Man!" Nelson exclaimed, "That burger was worse than licking twenty."
by Theinconvienientlie May 16, 2012
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