(in new zealand) to '
sack it' is to 'drop your
sack' or 'drop your
nuts'. in other words, bitch out of something or fear something.
"bro i was gonna fight that massive cunt"
"fuck off bro, you sacked it"
or
"bro is it true you
broke that
window"
"yeah man, fuck i'm sacking it"
or
"fight that dude, you better not
sack it cunt"