Source: Training Day
A montage of shots featuring a man, identified as Alonzo Harris from the film Training Day, staring intensely. He alternates between sitting in a car and standing in an office, ultimately pointing at his own eyes and then towards the camera to mimic an 'I am watching you' gesture.
Used as a reaction to indicate that someone is being watched, monitored, or that the viewer is suspicious of someone's behavior. It conveys a sense of vigilance or distrust.