can't hack

To be lightweight

Kiana drank two sips of beer and she was wasted. She can't hack.

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can't hack it

1) Basically like if you can't handle someone or something.
2) or if you don't understand something

1: "mate did you see the snow outside?!"
"Yeah it's so cold, can't hack it mate!"

2:"Have you started Miss C's work yet?"
"Nah, Its so hard I can't hack it!"

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