It's not a federal offense, but you will get suspended.
to expose your body parts to someone
Fingering is a slang term for the femaleversionof masturbating, and mooning is to show your bottom to someone.
Showing your bare backside to someone
If you are mooning over someone, it means you really like them and you cannot stop looking at them or talking about them. You have a desire to be near them everyday and all the time.
Mooning is the correct spelling.
Usually that the person doing the mooning has showed someone his naked butt. Exposing the butt cheeks AKA the "moons".
Mooning someone is a gesture in which a person exposes their buttocks by pulling down their pants and underwear. It is often considered vulgar or inappropriate behavior.
(mooning)
Indecent exposure, which in SOME jurisdictions can be considered a sexual offense-chargeable crime.
Is mooning against the law in California?
tell them that they smell bad!
There is something wrong with mooning someone else, even if done in fun. Remember, the police never think it's as funny as you do, and mooning other people in public (in most places) could result from a warning from a police officer, and if you continue, could result in an arrest for public nudity.