Repetitive noises and words

I’m normally a pretty patient parent with my son who is five and we have a lot of stuff we’re trying to figure out with him speech wise and possible adhd. Just very long wait times with doctors being backed up. But until we can get things figured out my son is OBSESSED with making fart noises and saying the words poop and butt. It’s literally driving me mad. I CANNOT get him to stop. He makes the noises and says poop ALL DAY LONG I’m hoping someone out there has tips for getting him to stop. Thanks!