POS on is used when there is a PARENT OVER
SHOULDER watching 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?