look up any word, like dirty sanchez:
 
1.
Directed to someone who is acting out of control or acts like they are on drugs
Are you on crack?
by Nix & BL June 20, 2001
 
2.
1. The actions/words you just displayed are unbelievable!

2. You're not your normal self, Jim.
Why are you laughing so much? Are you on crack?
OR
Stop vomitting... are you on crack?
by fallacy October 30, 2001
 
3.
When someone says something that is either unbelievable or utterly foolish and stupid.
Giraffe: Im not a retard. D&S: Are you on Crack?
by blazer275 February 06, 2011