To express aversion or repugnance for something. An expression from the TV show 'The Simpsons'.
Mr. Burns - "Smithers are they booing me?"

Smithers - "No sir, they are saying Booerns. BOOOOERRNSSS"
by Alex Woods February 19, 2007
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To express distaste at something, to be displeased.

Origin: Simpsons
"Sorry, I'm busy during our free period."
"Booerns."
by Kyle The Great October 25, 2004
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