Using a cellular device to send pornographic photos or videos of oneself to another. After recieving a sext message you are then supposed to forward it to every person you know, telling each one of them to do the same, until the entire world has seen it, and everyone thinks your friend is a slut. Can sometimes result in a law suit.
"While my mom was sexting my dad, she accidently forwarded the message to me, forcing me, according to the sexting law, to send the message to all my friends." That night, all my friends died.