A phrase in place of 'give it up' or 'forget about it'. It has even been used in place of 'can't be bothered'.
Q-Do you want to do some work today?
A-Nah, sack it off.
Q-They've already gone. If we left now, we could probably catch them up...?
A-Nah, sack it.
© 1999-2015 Urban Dictionary ®
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