Boo Urns thus is an alternative to saying Boo, if you wish to Boo someone or something without them actually knowing
me: Wolverine was so shite, Deadpool was only in it for 10 minutes
you: BOO-URNS!!!! BOO-URNS!!!
me : I have to finnsh work an hour later
you: That's freaking boo-urns we we're gonna go to the movies.
Exclamation. A cheer for The Simpsons character Montgomery Burns. Often used incorrectly by Canadians to suggest disproval of anything, rather than approval of Burns.
Obviously, "boo" and "Boo-urns" are two different and mutually exclusive words.
People who don't understand how to use the word or cannot understand the word's useage as it appeared on The Simpsons. Boo or boo-urns. There is no try.
"Are you saying 'boo' or 'boo-urns'?" - C.M. Burns, The Simpsons
It comes from an episode of The Simpsons when Mr. Burns made a film for a film festival that no one in the audience liked, so they booed him. Burns, being surrounded by yes-men for his whole life was unfamiliar with being booed so Smithers told him they were chanting "boourns" rather than booing.
Mr. Burns stood up and asked the audience if they were booing or if they were chanting boourns. They responded by booing him, except for Hans Moleman who admitted to chanting "boourns" which leads one to the conclusion that Moleman liked the movie and was using the expression to show his enjoyment.
Other Guy: "You idiot, boourns is used for a good movie like Borat."