Very, extremely.
That trick was crazy good.
An insane or eccentric person; a crackpot.
Now drink up, you knuckleheads! Have a blast! It's our night, you crazies! Chloe, where are you?
From craze (“to crush”) + -y, akin to being "crazed up". Compare cracked up (“suffered a mental breakdown; be insane”).
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Eccentric behaviour; lunacy; craziness.
Then again, her whole evening was full of crazy, and she didn't know what else to do.