Getting fired from your job. Australians use this phrase a lot. Probably from the pioneer days when the boss would throw a bag at the farmhand/miner/builder/labourer's head, tell him to pack his stuff and get lost.
"Bloody hell, the boss gave me the sack!"

"Are you going to get the sack for skipping work yesterday?"
by oneof20million June 10, 2009
Get the get the sack mug.
Definition #1: In American Football, a breakdown in the protection of the offensive line that results in defensive penetration and results in the Quarter back being tackled at or behind the line of scrimmage and Getting Sacked.

Definition #2: For a female to be thoroughly and satisfyingly fucked by a male lover. Getting Sacked means fucked to the point of exhaustion. To have been dicked so hard and so good that the need for future sex may not be needed because the highly satisfying sex session and mind blowing, leg shaking orgasm may never end.

Definition #3: Getting multiple, stiff man poles shoved deep in your bunghole and getting your ass pillaged for sexual pleasure in an orgiastic setting.
Example 1: During the third quarter, the offensive lineman lost focus on the game because he was thinking about Tom's girlfriend Gisele. The end result was Tom getting Getting Sacked.
Example 2: Carla's new boyfriend was well hung. She discovered that length was not the secret to great sex, but rather girth. Frank's Summer Sausage stretched her love hole from lobe to lobe and drove her to multiple mind blowing orgasms. Never before had she experienced Getting Sacked like this.
Example 3: Dan was so looking forward to Pride Fest. Every year it seems to be better and better. This year his goal is to do nothing except Getting Sacked.
by Eaton Holgoode April 30, 2015
Get the Getting Sacked mug.
Boss: Sit down and get back on the phone.
Employee: Jeez, get off the sack!
by the-jerk June 23, 2007
Get the get off the sack mug.
U are getting on my last nerve, would u please get out of my face?
sack annoying nerves
Mother: Did u take the trash out? I told u to take out the trash, do the dishes, make ur bed, clean ur room, etc.
Jack: O my god!!! I said i wud do it, get off my sack.
by Breezy12 July 11, 2008
Get the Get off my sack mug.
A phrase intended to remind magical thinkers of the ridiculousness of their claims.

Irish comedian Dara O'Briain first used the phrase in his stand-up performances when talking about priests, astrologers, and the like. He said that he would put them all in a big sack, tie the sack up with string, and hit them all with sticks.

He then went on to say that when someone gives a facile answer to a difficult question, and that person is then asked to provide evidence, but replies with "There's more to life than evidence," the proper response to that magical thinker is "Get in the fuckin' sack."
Hey, what happens to us after we die?

Oh, the good people go to live with god, and the bad people suffer for all eternity.

What's the evidence for that?

It's in the Bible.

Get in the fuckin' sack.
by Non-magical thinker January 30, 2010
Get the Get in the fuckin' sack mug.