Just that really. At a family get together he said this to his cousin within earshot of several other kids. I dont know the context of how it was said but said cousin immediately came to tell us. My dh went upstairs and told him off, but I am just so embarrassed and appalled that he knows how to use this word! It's not used by me in front of the kids but he has definitely overheard dh saying it. What is the best approach to take to prevent this happening again. I am mortified!