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1.
when a situation goes to hell beyond normal control, typically a result of extreme drug or alcohol consumption. Can also be used in a postive sense even when you know you are going to have fun but it may be a long night with bad repurcissions...
We just popped an e-pill and this night is about to be all bad....

That bitch looks all bad....
by Sara5656 November 16, 2007
 
2.
To not be good at all.
Bro, that mess was All bad.
by Terik Springfield July 08, 2006
 
3.
When somethings nothing but all bad. Bad Idea. Or when something went wrong
Man cuz, thats all bad.
by Breezio May 27, 2005