The phrase me agarró de lado is Spanish for he caught me from the side, and that literal meaning is why the clip travels so well online. Short Spanish phrases are widely reused as reaction audio on social media, edits and soundboards because the wording is catchy and the situation is easy to understand. This one is shared mainly for its surprised tone rather than for a longer scene, so creators drop it into unrelated videos as a standalone joke about being ambushed or blindsided unexpectedly.