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A Clug Nugget (or Cluggus Maximus) is a singular lump of dried poopoo stuck in and amongst anus hair, usually brought about by an unsuccesful wipe after defication.
Dave: Yo man, I dropped the biggest steamer yesterday and I think i've got A Clug Nugget! So not down with this.

Henry: Dirt man.
by Hawkerz July 29, 2011