Geburtstags Rülps combines the German words for birthday and burp, and the clip circulates mainly as a WhatsApp audio forwarded for birthdays rather than as a clip from a film or show. Its short length and voice-effect processing are typical of novelty audios made to be shared in chat apps, where a single rude sound can replace a written greeting. German-speaking users reuse it year after year for the same friends, and it has spread as a general birthday burp sound effect beyond those chats.