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!"

can't hack it by puresource May 8, 2016