A signal among modern day hippies that law/drug enforcement was near. Named for the six lights that sat atop most old cop cars, it is a way to warn others without implicating oneself.
"6 up, 6 up, in the Dave Matthews tie-dye!"
by Funthrax January 31, 2007
A derivative of Heads up, this term was widely used(shouted) in the lot before and after Phish shows in order to alarm surrounding bystandards that law enforcement was in the vicinity and to conceal any contraband immediately. It was often used on shakedownwhen an undercover officer was discovered, or a regular officer was on the prowl and somewhat hidden by the general crowd. It was also seen on a popular fan made t-shirt which used a parody of the 7Up logo and read "6 Up, The Uncoola".
Head #1: "6 Up!"
Head #2: "Shit, stash those goo-balls and caps!"
by L-Pie January 23, 2006
Term used to keep on the look out, Look behind ya, look out for pigs (police)
yo, my dawg..... 6-up
by MoReaL January 28, 2005
1. Police have entered the premises.
2. Watch your ass!
3. Look Behind You
YO! 6-UP!
by darkarw July 10, 2008

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