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Generally someone whose actions would lead one to believe that the person is using crack cocaine due to the stupidity or messed-up-ness of their actions.
Used to describe something stupid, messed up or to express frustration with something
Man, you on crack! You will never get with that chick.

That biology report is on crack man.

Dude, Ms. Stanton's on crack! She gave me a friggen C+!!!
on crack by TheDuke January 25, 2005
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1) Unbelievable; insane.

2) Good, bad, or extremely out of the ordinary.

Note: Both definitions an be used in both positive and pejorative sense.
I did horribly on that test. Question 5 was on crack.

I'm so happy I got promoted. My new salary is on crack.

My cell phone is on crack. I need a new one.
on crack by Matthew Morrison September 7, 2008
if something is mad, bad or just plain wrong, it can be described as "on crack", or, for added emphasis, "so on crack".
george bush is so on crack.
on crack by robert June 16, 2003
Also used to describe a person on serious drugs.

Also used to describe a person using Crack-Cocaine.
Jamal is "on crack", thats why he is in the rehab
on crack by Michael January 18, 2005
A crackhead, or someone on crack, is someone who acts based on their last brain cell, another example being Lee Heeseung
Wow, He was on crack last night at the bar.

on crack much 

It is mainly used as a smart ass response in a situation.

If one person in a group of friends says something in a hyped up sentence, & what they say seems crazy or weird.

One of their friends usually says this back as a smart ass remark, about what the other guy said.
1.- "Hey dude, i just bought that new Ps3 game, do you want play it?!"

"Response" "Of course i do, you on crack much?"

2.- "Hey man, that's not how it went, your not understanding what went one!"

"Response" "Dude are you on crack, i saw what happen man, don't lie to me!"
on crack much by VictusNos March 18, 2008

Are you on crack? 

Directed to someone who is acting out of control or acts like they are on drugs
Are you on crack?
Are you on crack? by Nix & BL June 20, 2001
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