POS is an abbreviation that stands for 'Parent over shoulder.' It is used in texting to warn the recipient that their parent is nearby and may be able to see their messages or screen.
POS is a commonly used texting abbreviation that is often used by teenagers or young adults who want to communicate without their parents knowing. It is also used by people who want to give a warning to their online friends or chat partners that they may have to end the conversation abruptly.