Tone indicator, mostly used on Twitter, to clarify that you mean what you said in a good way. It's believe to have started as a way for autistic people to understand what tone a conversation is having. "POS" stands for "positive".
"All you have to do as the writing staff of an NBC show is incorporate Positive Mentions or Pos-Mens of GE Products into your show." - Jack Donaghy, GE Chairman of East-Coast Television and Microwave OvenProgramming
The pain associated at the tip of the index finger from repeatedly banging it into the touchscreen of a Point of Sale register. Commonly found in retail and customer service based occupations. Seek medical attention/new career if the problem persists.
It was only 45 minutes into Jane's shift and she was already complaining about her POS Finger symptoms. She'll have to use her middle and ring fingers for the next couple transactions.
POS on is used when there is a PARENT OVER SHOULDERwatching what u say and it is a warning sign to your friend online that they should watch what they say.
POS off is used when there is no longer a parent over your shoulder.
Mark: wtf are you talking bout?
Mary: POS ON
Mark: yeah i did watch the new episode of family guy :)
Mary: yeah it was hilarious Mary: POS OFF
Mark: okay anyways..back to topic..wtf were u thinking?