noun

• (submarine navigation) A pulse of high-pitched or ultrasonic sound whose echoes provide information about nearby objects and vessels.
  "The submarine sent out a ping and got an echo from a battleship."
• (networking) A packet which a remote host is expected to echo, thus indicating its presence.
  "The network is overloaded from all the pings going out."
• (text messaging, Internet) An email or other message sent requesting acknowledgement.
  "I sent a ping to the insurance company to see if they received our claim."
• (networking) Latency.
  ""You low ping c**t, you only win cos of your ping!" > > And other such insights into why I was winning."

verb

• (submarine navigation) To emit a signal and then listen for its echo in order to detect objects.
• (networking) To send a packet in order to determine whether a host is present, particularly by use of the ping utility.
  "I'm pinging their server."
• (by extension) To send an email or other message to someone in hopes of eliciting a response.
  "I'll ping the insurance company again to see if they've received our claim."
• (colloquial) To flick.
  "I pinged the crumb off the table with my finger."