Lick me up and take me like a vitamin
She says “like a vitamin”, meaning like a taste of your own medicine. A bit of nutrition and wisdom that you have to take because even if it is unpleasant, you need to have it. She is telling the haters to see how it feels to know that putting someone down is cruel, and now they have to deal with being wrong about it by hearing her on the radio and getting a taste of her success from afar.
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