Thanks for the suggestions, ladies. I like the idea of alternative words, fudge cake could be popular!

Misty, I think he is modeling it from all over! As I said, he has heard DH and I swear, although not often in front of the children. Several of his mates from school have older brothers and I know he has learned a few words from them. And if you listen, I reckon you hear someone swear every time you leave the house!

My concern is not so much that he has heard the words, but that he uses them even after he has been reminded not to!