Tsundere is a long-running anime and manga archetype for a character who is initially harsh, cold or dismissive, then gradually reveals warmth and affection, and the joke has travelled far beyond its original fandom through edits, reaction videos and short-form clips. This sound is used online in that wider meme sense, rather than as a clip tied to one named series, letting creators signal the whole trope in a few seconds. It fits naturally alongside other anime reaction sounds and works best for audiences who already recognise the denial-before-affection pattern.