Often misheard from the phrase 'battery in your back', butter in your back is a mishearing which can be sexual or great for black people who like red lobster.
Jan: "Yo, Steve said he would put butter in your back Carl"
Steve: " I said battery, not butter but I can put butter in Carls back"
Carl: I'ma call a helpline
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Sharon: I'ma butter the back of this lobster.
Jack: At least boil the little guy with his dignity.