YOU SAID:

i fell on an ant hill and have ants in my pants

INTO JAPANESE

蟻塚に落ちてズボンに蟻が入った

BACK INTO ENGLISH

I fell into an anthill and got an ant in my pants

INTO JAPANESE

アリ塚に落ちてパンツにアリが入った

BACK INTO ENGLISH

I fell into an anthill and got an ant in my pants