A woman's fine ass. Pronounced like the word Donkey (ass), but spelled differently to differentiate the negative connotations and ugliness associated with the word donkey.
A Doncus is a person who likes soccer and hockey...usually he likes to take strange pictures that would be often described as Doncus, a Doncus is a 6 letter word with two syllables Doncus is a noun.
Person 1: dude you are such a doncus
Aidan: whats a doncus?
A super sexy brunette that hates stupid ass fucking blondes. She's from deutchland and a really nice warm vagina. She is the most beautiful awesome girl ever and i love her!