The time it takes for a network packet to leave your computer, go to another one, and return. Lower = better. Can also be a source of gloating in network games. Typically measured in milliseconds.

The sexy sound that the M1 Garand makes when its out of ammo in its magazine

The sound you hear when someone sets off your gaydar.

"Packet Inter-Networking Groper." PING Can be used as a command in MS-DOS. Early computer programmers used this acronym because of it's similarities to a SONAR ping. A computer ping will send a packet of data from one computer to another to measure the time it takes for information to be sent and received. Pinging a computer can also help diagnose problems within networked computer systems.

a virtual "poke" (email, instant message, etc.) usually sent for reminder purposes.

To ping someone is to notice them. It is used by intelligence operatives on a surveillance detail, usually when the target of the operation has become aware that they are being watched, which is carefully guarded against and undesirable as it prompts the target to practice counter-surveillance drills, making them difficult to follow and usually more dangerous because they are likely to alert their colleagues that they are 'blown' (exposed) and likely to bring terrorist-type activities forward in time and even to change their specific plans so as to avoid failing in their overall mission. It derives from the characteristic sound made by a submarines sonar equipment.

To send a short message, expecting a yes/no response. Originally from submarines, where a ping sound was emitted to listen for echoes from other vessels.