The phrase onii-chan daisuki combines the affectionate Japanese term for an older brother with daisuki, meaning to really like or love someone. It is widely used across anime and fan culture as a cute, exaggerated expression of admiration. Short voice clips of the line spread through meme edits, Discord servers and short-form video, often alongside other anime voice memes like Poi? Yuudachi. Because the wording is instantly recognisable to anime fans, creators reuse it as shorthand for devotion, teasing or ironic sweetness without needing any wider context.