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2.
A man who rapes or beats his nephews and nieces or other children, or treats children like dirt. Originally a character from the book Once Were Warriors by Alan Duff, which was also made into a movie.

A man who asked 5 boys in his care to call him "Uncle Bully" was recently arrested for assault.
You're no better than Uncle Bully, I should cut your dick off!
by Bloopy April 09, 2005
 
1.
A term for a rapist or someone whose just a dirty c*nt, can also be shouted at your local if you want someone to buy you a round STAT!!!
"Guy walks into a bar and yells UNCLE F*CKEN BUUUULLLLYYYYYY!!!!"

"locals buy the guy beers so he doesnt beat the sh*t outta them"

Man rapes a woman, his friends go "yuck what an uncle bully".
by Sailor Ness May 09, 2009