What is Booerns?
1.
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"
See
2.
To express distaste at something, to be displeased.
Origin: Simpsons
"Sorry, I'm busy during our free period."
"Booerns."