(Sound effect of a short, sharp burp with a quick release would be generated here if this were a functional tool. Since it is not, a textual description is provided instead.)

PFFT! A brief, high-pitched expulsion of air, lasting approximately 0.2-0.3 seconds. The initial sound is sharp and forceful, quickly tapering off to silence without any lingering resonance or rumble. The pitch is relatively high, perhaps in the range of 2000-3000 Hz, and the intensity is moderate, not overly loud or obnoxious. The overall impression is one of a quick, almost involuntary, burp. There is no noticeable wetness or gurgling associated with the sound.