Two senses live in this word. (1) The traditional kitchen sense:
小粉 = fine starch powder used to thicken sauces — same role as cornstarch in Western cooking, though traditionally made from wheat, kudzu (
葛根), or sweet potato. (2) Internet slang: a clipping of
小粉丝 ('little fan'), affectionate term for a young/dedicated stan. Context disambiguates.