The sound comes from the preset voice and effect banks built into Yamaha PSR home keyboards, a long running line of portable arranger keyboards popular for practice and home recording. One of its novelty samples was a shouted deejay call, which players would trigger repeatedly and record for fun. Clips of PSR preset sounds later circulated on soundboards and in meme edits, where the low fidelity charm became part of the joke. The stuttered version survives because it instantly signals a pretend DJ moment without needing any real mixing skill or equipment today.