It's okay! The more you know! Non-Playable Character. Gaming terminology.  Example: If life were a video-game the body that you control would be considered your player character. This means you, being an intelligent being, control your body (character). A NPC is a character that performs scripted events, such as actions or saying words or basic conversations. Hence NPC being used to describe individuals who spout bullshit as truth and/or act in very predictable ways as we see with leftists.