The act of leaving several forgotten group chats with intentions of clearing your DMs, at the expense of everyone else in which their DMs are drowned out by leave-notifications of the resurfaced group chats. This can cause a chain reaction in which by instinct, some users may start leaving the group chats to reverse the tidal wave of spam in their DMs, which only worsens the spam for the remaining users. It is considered one of the biggest middle fingers you could give over the platform, rivaled by the "Mr. Ping Challenge."
person 1: dude, i just got like 37 discord pings wtf

person 2: for fuck sake, same here dude. some dumbass just did a discord 99
by mrping69 November 5, 2020
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Level 99 characters usually do the max amount of damage (9999) with every attack
by Xtreme2252 July 20, 2009
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A military occupational specialty (MOS) for the U.S.'s version of suicide bombers. A 99 Tango is the occupation of repairing missiles in-flight. The soldier jumps from an airplane and attempts to land on the missile, complete any needed repairs, and get away before it reaches its destination.

This, of course, is a suicide mission as any damage to the missile will result in either its immediate explosion, or the missile will reach its destination before the 99 Tango can get away.

As expected, this MOS requires a Top Secret security clearance, as no U.S. Citizen can know that their government has its own suicide bombers.
PVT. Bailey was a 21 Bravo, but his drill sergeants found out he was crazy and switched him to a 99 Tango.
by PVT Crazy-FLW, MO 35Eco Eng BN September 23, 2009
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Where bone thugs slang there dub sacks, smoke weed and drink brews
"Est. 99 is where you'll find me slangin' that llelo baby"
Shots to the double glock
by Kezza99 November 2, 2007
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When a person is born on 1999 and still classes themselves as a "90's" kid
"Man I miss the 90's"
"Oh, when's your birthday?"
"31st December 1999"
"Oh you're a 99' baby"
by TheRarestOfPepe's December 3, 2015
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Slang common among those who play the madden NFL video game. "99" represents the highest rating in a caqtegory. "Tuff" is exactly what it sounds like, tough. But the fact that it was spelled with two F's makes it that much cooler. The term carries over into everyday random conversations which makes it funny.
"Did you see Marty take that punch like it was nothin?"
"Yeah man, he is totally 99 tuff brah."
by STRiKER45 February 2, 2010
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