نص أصلي - انجليزي - I just knew the judge and my dog would hit it off

Personal pronoun

I

instead of ninth letter of the alphabet

i

.

Done, thank yoou

CC: gamine

It seems my English is not good these days!!
What would that possibly mean?
Is someone planning to hit a court's judge?

CC: kafetzou

"to hit it off" means to get along well, or to become friends.