R.
I just had to respond even though you have already received lots of good advice. I have a 3 year old boy who likes to say that stuff too and he isn't in daycare. He even goes as far as answering a request with "OK poopy." I had enough yesterday. I was continuously warning him that I would wash his mouth out with soap if he said it again (after all the niceties of "we don't talk like that in this house etc...) and I never had any follow through. Yesterday I didn't warn him. I just took him upstairs to the bathroom and stuck a little hotel bar of soap in his mouth and made him hold it there. All I could think of was Ralphie in "A Christmas Story" with that soap in his mouth. It seems to have cured the "potty mouth" He slipped up once last night and I just gave him a look and he realized what he had said. He hasn't said anything more. Hope this helps.