Expurgate: Remove matter thought to be objectionable or unsuitable from a book or account. As in,“Every savvy high schooler knows that she (or he) needs to expurgate their notes once they are passed to avoid the dreaded ‘read it aloud to the classroom’ punishment. Inspector Gadget taught them to self-destruct their communications, but since that’s not possible in school, expurgation is a prime second option.”
Didn't everyone get their lessons of how to be a secretive teenager from Inspector Gadget? Everything I needed to know, I learned from Nickelodeon.