The vocal comes from Imogen Heap's Hide and Seek, released on her 2005 album Speak for Yourself, where she sang through a vocoder harmonizer that turned her voice into layered, choir-like harmonies. The line was later sampled in Jason Derulo's 2009 hit Whatcha Say, which brought the phrase to a much wider pop audience. Years later the isolated 'hmm, whatcha say' moment resurfaced in short-form videos as a shorthand for disbelief and dramatic suspense, and it endures because the three-second hook is instantly recognisable even without the rest of the song.