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1.
When someone says "six up", it means the police are nearby, so whatever you are doing that is illegal you'd better hide it.
This phrase is most commonly heard in parking lots at Phish concerts where many people openly sell or use drugs, or illegally vend food or beer. "Six up!" is used to give people a heads up when the cops are coming around or when there is an undercover cop trying to bust people.
de Bob Williams 29 mai 2003
 
2.
Refers to police being in the area -- refers to the lights on the top of the car (six lights)
"Psst! six up, shut up!"
de Mcdizzle 18 mai 2008
 
3.
Military expression for "watch your back"
Commonly shouted by nudists on Wreck Beach, Vancouver, British Columbia, Canada when the cops are on the beach. Known mostly to locals as a warning to stop doing anything illegal.
Sixup!!!!!!!! (echos down the beach) Sixup!!!!!!
de annimal 17 novembre 2012
 
4.
A lesser gypsy soda pop, flavored of wheat and corn.
Six Up; the lowly brother of the now famous Seven Up.
de Ba77er 9 novembre 2006
 
5.
A lesser gypsy soda pop, flavored of wheat and corn.
Six Up; the lowly brother of the now famous Seven Up.
de Ba77er 9 novembre 2006
 
6.
something that you can say to get arrested and questioned for being homeless at a show.
If you say "six up" you will get jumped.
de Hood 28 juillet 2003