YOU SAID:

So then I slapped him with the back of my hand and called him a cur

INTO JAPANESE

それで私は彼を手の甲で平手打ちし、彼を「カー」と呼びました

BACK INTO ENGLISH

So I slapped him on the back of my hand and called him 'Ka'

INTO JAPANESE

だから私は彼を手の甲に叩きつけて「カ」と呼んだ

BACK INTO ENGLISH

So I slammed him on the back of my hand and called him "ka"

INTO JAPANESE

だから私は彼を手の甲に叩きつけて「カ」と呼んだ

BACK INTO ENGLISH

So I slammed him on the back of my hand and called him "ka"