Place it at the very end of a short exchange, after a WhatsApp message sound sets up the reply and before a Kiko laugh answers it. That order gives the gag a setup, an interruption and a reaction, without letting another joke compete for the same beat.
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This is a single burp lasting under a second, a wet, guttural burst that arrives suddenly and cuts off just as fast. It feels crude, silly and deliberately gross, the sort of rude noise that turns an ordinary exchange into a joke in an instant. Best saved for moments that need a shameless interruption rather than a polite reply.