We use the phrase, "Thanks for letting me know you need 5 (10) minutes of silence." or "Give your mouth a hug" this is putting your hand over your mouth, or "double hug" (two hands) if these don't work we give our sons the choice to either make the noise/comments in their room, or practice their silence/mouth hug. When I have been in the car I have pulled over to give myself a break from the noise/repetitive phrases and stand next to the vehicle. Our boys know that I get back in the car when it is quiet. I tried this out the first time when we weren't in a hurry and we were going somewhere important to them. Then when we were in a hurry all I need to say was. "hum, I think I need to pull over and have a break from the noise." and it worked. Just know we have been applying these ideas for years and I still need to use them. With time it gets easier to redirect them. Best of Luck, hang in there.
If he is able you could say, "That kind of talk lets me know you want to help clean the bathroom." and give him a bathroom chore equal to his ability.

Sharla the "Sounds like you want to clean the bathroom" worked like a charm! It took 3 -4 times but it stopped that annoying behavior!

Keep it up mishc97, it will work again but he may come out with worse behavior, which is a good sign that is it working. You can ask any behavior specialist, there is struggle to change the unwanted behavior. This is a good sign that it is working, just hold on and he will realize his behavior is not acceptable. Yes, out ASD kiddos need lots of repetition to correct their behavior, but you can do it mishc97, you are awesome.
We have been applying these behavior strategies with our boys for over three years and it have dramatically improved their behavior.

That is attention seeking behavior, I would ignore it and if you cant ignore it...use positive reinforcement when he isnt talking gibberish or bathroom humor, however the more attention you give it..the worse its gonna get.

Actually,I told him today "Wow,sounds like your potty mouth means you want to clean the potty. Let me get you what you are going to need." It got really quiet all of a sudden (crickets chirping anyone?). I can't believe it worked! Course, as we all know, doesn't mean it will work again tomorrow!
Angela, yes I am aware that is normal for his age group, but he does it (and pretty much everything else) to excess.
He never babbled like a baby when he was an infant, but now that he is older, he thinks it is funny.