Let's spell out words instead of saying them

Adventure Boy has been spelling lots of words that he hears. I suppose it comes from me spelling words to whomever is on the other end of the telephone line. Especially when I don't want the boys to understand what I'm trying to say.

Now AB is spelling words when he talks. The boys were watching Tom & Jerry and AB told their cousin that T-O-M is D-U-M-B. Their cousin agreed. Then UB says, yes, he is very D-U-M-B in this one show. Their cousin agreed again. AB then said T-O-M is a pretty D-U-M-B C-A-T right? The cousin looks at both of them and asks, "Why don't you all just say the word?"

Their response?

"That's a bad word and we are not supposed to say it."