The phrase comes from Curb Your Enthusiasm, the HBO comedy created by and starring Larry David, where his character often uses the understated line to praise something while refusing to sound impressed. It became one of the show's most quoted catchphrases, repeated by fans in episode discussions and later clipped for short-form video. As a reaction sound it spread on TikTok and YouTube, where creators use it as a verbal stamp of approval for anything from food to gadgets. Its staying power comes from how easily it fits both genuine praise and gentle sarcasm.