A defense readiness condition (DEFCON) is an alert posture used by the United States armed forces. The DEFCON system was developed by the Joint Chiefs of Staff and unified and specified combatant commands. It prescribes five graduated levels of readiness (or statuses of alert) for the U.S. military, and increase in severity from DEFCON 5 (least severe) to DEFCON 1 (most severe) to match varying military situations.
DEFCONS are a subsystem of a series of Alert Conditions, or LERTCONs, that also includes Emergency Conditions (EMERGCONs).3 DEFCONs should not be confused with similar systems used by the U.S. military, such as Force Protection Conditions (FPCONS) and Watch Conditions (WATCHCONS), or the Homeland Security Advisory System used by the United States Department of Homeland Security. The highest confirmed DEFCON ever was Level 2 (DEFCON2). Movies and popular culture often misuse the DEFCON system by "going to DEFCON 5" during a state of emergency. In fact, DEFCON 5 is the lowest state of readiness. DEFCON 1 is the most severe.
by WordMastah2010 November 3, 2010
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Defcon 1 is a code used amongst guys for when a woman is at that time o the month and should not be argued with, agreed with or even spoken to. God save any man who's girlfriend is at Defcon 1.

Defcon 2 is achieved when there are either 2 Women at Defcon 1 or if one Woman is so far into Defcon 1 she is psychotically raging around destroying all in her path. May God have mercy on her boyfriend's soul.
Guy 1: Hey man, whats up with your girl.
Guy 2: Defcon 1 man.
Guy 1: *makes sign of the cross* Godspeed.
by Nick October 18, 2004
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Drunk, alson see hammered or smashed
Yep, she's reached defcon 1
by P.I.M.P December 3, 2003
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A bad ass LAN center where you can pwn the crap out of |M-=O=-W|
Hey guys wanna go to defcon 1 and beat the shit out of the |M-=O=-W| clan?
by Vanilla Canada April 24, 2004
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We're all dead.
Defcon 1 was activated when the confederacy of jackasses and penises took over China and got ahold of their nukes, and proceeded to nuke the planet.
by JackassMcFuckadio September 4, 2021
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a kick ass network center where you go and own the shit out of noobs (like tom ott) with headshots.
"you andy, u wanna go to D1 2day so we can pwn tom?"
by |M-=0=-W| Owns All!!! April 12, 2004
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