is there such a saying

I was wondering if this is a saying "Im going to kill you with hugs and Kisses"

[Mister Micawber]

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It is not a proverb, adage or set phrase, but it is related to 'to kill with kindness' (= to be very/overly kind; to overdo in one's efforts to be kind), and could be a felicitious collocation in the appropriate conversation.
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[Philly]

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There's also the expression "smother (someone) with kisses".
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