This sound is the familiar comedy rimshot, often written online as ba dum tss. It comes from live comedy and variety performance traditions, where drummers used a quick sting to tag punchlines on stage. The effect later became a staple of radio, television, and internet humor, especially in short meme edits and WhatsApp audios. It is still widely used because the audience understands the joke format instantly: one line, one beat, and an immediate cue that the humor is intentionally cheesy or awkward.