(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"
by 4204298 December 6, 2013
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(v) To go to sleep

sack comes from the slang term for sleeping bag. so sack it literally means get in a sleeping bag, or go to sleep.
"Yo, im so tired, im about to sack it."

"Im going to call it a night, its about time I sack it."
by mrlarsen8 November 6, 2006
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To have sexual intercourse with somebody in there bed. Used as slag in dublin.
Ah jaysus love i want you in the sack!
by Orlababbyy July 7, 2008
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A more polite way of saying "fuck that" so you don't get in trouble with parents, teachers or bosses
Teacher: "Stay behind at lunch for a homework catch-up"
Student "I have people to meet, sack that"
by MacSki December 23, 2013
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To be fired from ones place of employment.

Also, to get "the sack".
"Sorry guys, can't go out tonight. I've got to save money since I was sacked today"

"Hey, did you hear Tracey got the sack?"
by seetheris August 11, 2005
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"Yo, you can go lick my sack."
by x January 22, 2003
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Bed...generally has sexual connotations.
Maria was a terrible cook and talked to fucking much, but because she had a huge rack and was a demon in the sack, Phil decided to put the cap on the kitchen cleaner and keep the ol' bag around for a little while longer.
by Nick D November 24, 2003
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