My ds asked last night what's a w**ker?
I told him not to let me hear him use that word again, and especially not to say it at school, it's rude and not nice. He wouldn't leave it at that and just had to keep asking, I wasn't giving in and neither was he. Eventually he asked Is it when someone plays with their willy? and, Does it really make you go blind?
BTW ds is 7.