The phrase comes from online slang where goofy ah is a softened way of saying goofy ass, and boi is a playful spelling of boy. Clips using the line spread through TikTok, Discord and meme edits as a generic roast for unserious behavior. Because the wording is vague, creators can apply it to almost any fail, outfit, dance or awkward moment without needing context from a specific show or movie. That flexibility keeps the short voice clip in rotation as a reusable reaction sound.