My girlfriend (18, F) keeps on jumping on my back and she is under impression she is cute when she does (16, M).. How should I playfully push her off?

I don’t want to hurt her as I push her down but sometimes it gets annoying. She is 5’2 101 lbs and I am 6’3 250 lbs

My girlfriend (18, F) keeps on jumping on my back and she is under impression she is cute when she does (16, M).. How should I playfully push her off?
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