Who worse? Raffi Torres or Matt Cooke?
A missile lock means that the guidance system for a missile can accurately track a target, and a fire-control system can calculate the required flightpath for the missile to hit the target. The lock is a function of the tracking system of the fighter or the missile's seekers. Usually the pilot selects a missile and its guidance system attempts to electronically track the selected target. Upon a lock, it indicates the same to the pilot either aurally or graphically and the pilot releases the missile when best suited. The common air-to-air tracking are infrared, active/passive radar and anti-radiation. - Edit: The seeker for the IR missile needs to be activated first, so technically the pilot presses a button to attempt the lock. And there could be multiple targets, in which case the pilot has to select the required target. For a within visual range missile, the missile's seeker detects and locks the target. Edit 2: The pilot could see the target visually, on the radar (if active), on the Infrared (if available) and over a shared radar network (if available). In all cases, the fire control system has features that allows the seeing device to select the target and transfer that data to the Infra Red missile so that it can lock on. For example, in certain aircrafts the missiles seeker is slaved to the helmet mounted display.
I've also read that some silicone cookware is only safe up to 300 degrees, so check the label on the baking sheets before you cook!