Definition of "Ping" :

noun: a sharp high-pitched resonant sound (as of a sonar echo or a bullet striking metal)

noun: a river in western Thailand; a major tributary of the Chao Phraya

verb: send a message from one computer to another to check whether it is reachable and active

"Ping your machine in the office."

verb: contact, usually in order to remind of something

"I'll ping my accountant--April 15 is nearing."

verb: hit with a pinging noise

"The bugs pinged the lamp shade."

verb: make a short high-pitched sound

"The bullet pinged when they struck the car."

verb: sound like a car engine that is firing too early

"The car pinged when I put in low-octane gasoline."