The sound comes from Scary Teacher 3D, the mobile prank game where players sneak around the house of the strict teacher Miss T to get revenge for her cruelty to students. Clips of her voice lines and reactions are widely clipped by fans for edits and soundboards because her exaggerated, grumpy delivery is instantly recognisable even out of context. This short hmm has spread as a quick reaction noise in gameplay compilations and meme videos, where its suspicious tone signals that a prank has been noticed.