Similar to "boo," only not quite the same.
Mr. Burns: Smithers, are they boo-ing me?
Smithers: Uh...no. They're saying boo-URNS, boo-URNS
Mrs. Burns: (To the crowd) Excuse me, are you saying BOO or BOOURNS?
Crowd: BOOOOOOOOOOOOOOOOOOOO!!!!!!!
Hans Moleman: (to himself) I was saying boourns.
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