Often they have no idea what they mean. If a toddler uses a bad word, ignore it. Probably it won't be repeated. When your child uses a bad word let her know it is not acceptable. Help your child think of another word or phrase to use.
Children enjoy using big words.
Be sure to explain what they mean. Teach your child that unkind or bad words can really hurt. Let's find a different way to let them know you are angry. Help your child learn other ways to express that feeling without using bad words. An activity such as riding a bike or reading a book, can help get rid of negative feelings.