999 ping is caused by games who do not allow more than 3-digit pings, and players who have such an incredibly laggy play that it's a wonder they're even playing...

Generally, it is above 999 ping, somewhere between 1200-4000... At 999 ping it is so unbearable that you may have to wait a minute just to know that the next round has begun.
That 999 pinger just joined the server!!! NOOOOOOOOOOOOOOOOOOOOOO!!!
by GunCat April 5, 2004
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In gaming, when a certain player has extremely bad internet, typical reaction from the playerbase of the game.
Dick: Player with bad ping
Will: "Hey guys look at Dick he's such a 999 ping lol xD"
Rest of community: "lol fucking ass cunt bitch buy a new modem lol skanker skrr skrr fam beat his ass"
by Man's cold May 11, 2017
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