The phrase comes from everyday colloquial Spanish, where pendejo is a strong insult commonly used across Mexico and Latin American Spanish for someone acting foolishly. As a soundboard clip, this short shouting version spread through meme edits, gaming videos and reaction compilations where a brief foreign-language outburst feels funnier and more dramatic than a longer rant. Its popularity comes from its clarity and timing: even viewers who do not speak Spanish understand the tone instantly, so the clip keeps being reused for arguments, roasts and exaggerated call-outs online.