When updating your facebook status with something aimed at one specific person without actually naming them. Or having facebook status with hidden meaning. The person in question knows that that this status is about them. Resulting in a response on facebook aimed at them. A slanging match or 'code-off' occurs.
'Dude what is her facebook statusall about, it's obviously about me?'
'I have no idea, why don't ya write one back and have a code-off'
Using your mouth and lips to create popping sounds to recreate morse code. This can be used when communicating with friends and coworkers in a new way so no one will know exactly what it is you are talking to each other about.
A bank teller used MCMP (morse codemouth popping) to alert a coworker she was being robbed to alert the authorities without the suspect in question even knowing!
When an ex-boyfriend/husband learns that new boyfriend has employed prostitutes in the past, then frantically texts and/or calls the ex to notify her of said past activities. Usually results in fisticuffs and trips to local hospital for ex boyfriend/husband.
Boyfriend:
"the ex told my new chick I was visiting the rub and tug" ,