[SamIAm]

I don't see why you have to have a general "no cussing" rule. It's your house, right? If you care so much about this specific phrase (and not others, you ass-hat) then say "In my house, we don't say G.D. Therefore, if you say G.D., you can't stay in my house."

Warn people ahead of time. Make the rule clear. Then enforce it. Just kick them out. If it seems blatant (as you suggested) then you won't have any problem kicking out the [censored] who's rubbing it in your face.

So, to answer your requests specific penalty times, I say "1 week".
-Sam