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.
Prices shown in USD.
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