Lil Jon, the Atlanta rapper and producer who helped popularise crunk in the early 2000s, became famous for shouted ad libs including yeah, what and okay across hits like Get Low and Snap Yo Fingers. His exaggerated yeah was widely sampled, quoted and turned into ringtones and soundboard clips as crunk moved into mainstream pop and comedy sketches. Online, creators kept the isolated shout because it is instantly recognisable without any beat, making it perfect for reaction edits where a single word needs to carry all the excitement.