The title is Portuguese and translates roughly as pig snot, which tells you exactly what kind of joke the clip is built for. Short animal noises like this spread on soundboards because they need no setup and work in any language, so creators save them for reaction edits, farm roleplay and prank compilations. At just over four seconds it is long enough to feel exaggerated but short enough to drop in without stopping a video. It stays popular for the same reason other gross sounds do, it gets a fast laugh or disgust reaction.