1. slang To be aggressively unavoidable. In this usage, "your" is typically used in the general sense, like "one's." I hate talking to opinionated people—their views are always in your face.

2. slang To aggressively interact with you, often implying physical proximity. The salesmen are going to be in your face the moment you walk in the door, so remember to say you're just browsing. That player was really in your face during the game. You were right to give him a penalty when he got that close to complain.