YOU SAID:

this is a big dumdum party wat losers here

INTO JAPANESE

これは盛大なダムダムパーティーだ、ここにいる敗者たちよ

BACK INTO ENGLISH

This is a big dum dum party, you losers here.

INTO JAPANESE

これは盛大なダメダメパーティーだよ、ここにいる負け組よ。

BACK INTO ENGLISH

This is a big no-no party, you losers here.

INTO JAPANESE

これは大した禁止のパーティーです、ここの敗者よ。

BACK INTO ENGLISH

This is a big no-no party, you losers here.