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!"
by puresource January 26, 2016
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Kiana drank two sips of beer and she was wasted. She can't hack.
by swagmonster73 March 19, 2016
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