Answer: booing

AnswerCrossword Clue
BOOINGFan disapproval
BOOINGShowing dissent, in a way
BOOINGUnhappy fan's pastime
BOOINGShowing disapproval
BOOINGVerbal disapproval
BOOINGVoicing disapproval
BOOINGSound of disgust
BOOINGPrompting the hook
BOOINGVoicing one's disapproval
booingthe act of saying boo