YOU SAID:

Thats a knee slapper aint it

INTO JAPANESE

それはニースラッパーじゃない

BACK INTO ENGLISH

that's not a nice rapper

INTO JAPANESE

それはいいラッパーではない

BACK INTO ENGLISH

that's not a good rapper

INTO JAPANESE

それは良いラッパーではない

BACK INTO ENGLISH

that's not a good rapper