On fine hair, serum is usually a Debbie Downer: One drop and your style goes, Wah waaah. (redbookmag.com)
What strikes first upon entry to Pace Gallery on West 24th Street is the persistent thrum of muted noise: the creaking of shaky machinery, a droning waaah, an intermittent snippet of what sounds like a vacuum cleaner's motor. (brooklynrail.org)