booing

noun

A disapproving exclamation by a member of an audience.
“How is women's music to be defined for the purpose of holding a national women's music festival? In the past five years, the festival apparently experienced controversy due to contrasting definitions of women's music. There were walkouts and booings of performers who didn't fit within the limitations of some audience members' concepts of women's music.”
“The riot sometimes spills over into the audience, and Kosky bears the proud scars of the booings he has endured.”