Definitions from Wiktionary (pinger)

▸ noun:  A device that emits a short, high-pitched sound burst, such as in sonar or other echo location systems.
▸ noun:  A device that periodically emits a signal that can be monitored to permit movement tracking.
▸ noun:  A computer program that sends a ping message over a network.
▸ noun:  A user of a ping program; one who pings.
▸ noun:  (slang) An illicit drug, especially ecstasy, taken for recreational purposes.

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