Dog bone means: a bone that is given to a dog to chew on and play with, similar to a dog biscuit. They can be real bones, or they can be made of other materials like plastic or leather.. There is no real cause for parental concern; it is descriptive vocabulary rather than risky behaviour. If your teen uses it, context will usually make the intent clear. A short, curious question about where they heard it is usually all that is needed to know whether to follow up.