Bostezo simply means yawn in Spanish, and clips labelled this way circulate on soundboards as a quick, language free reaction sound. A yawn is recognised in almost every culture as a sign of tiredness or boredom, so the clip needs no translation or context to work in an edit. Short yawn effects have become common in meme videos, sleep related compilations and study or work humour, where a single exhale can replace a line of dialogue. Its popularity comes from that instant readability and its short, clean timing.