sack up 

A demand to be a man and to stop acting craven or cowardly. A derivation of man up (which in itself is a derivation of cowboy up), although more insulting. While man up can be used as encouragement to do something, sack up is almost always a challenge to cease doing something that should be beneath you

"Oh sweet mother of god! The terrorists are going to blow us up with Snapple bottles!" _This_ is terrorism's A-game? Sack up, people.

sack up by Quine August 13, 2006

Stack Up or Shut Up 

A common term a hardcore 2nd Amendment Supporter will tell Anti-Gunners that want to confiscate guns.
Usually, these lefty's want government goons like the Alcohol, Tobacoo, Firearms and Explosives or known as the ATF to confiscate your guns instead of themselves as they are cowards.

Lefty: You don't need your AR-15. We're coming for them.
Average Gun Owner: You gonna come get them yourself? Stack Up or Shut Up!

Stack Up or Shut Up by AnCapGigaChad June 6, 2022

Fut the shuck up 

Another (more awesome) way of saying "shut the fuck up".

Person 1: Hey man, your mum's a dog.
Person 2: Fut the shuck up asshole.

Fut the shuck up by Jackusssssssss January 15, 2009

Stack up 

A formation used by military and law enforcement in which individuals line up single file along the same wall as the door they plan to breach in order to get through the door quickly and efficiently

“ Dude I think that house is about to get raided, I just saw a dozen guys with ATF jackets on stack up outside the door”

Stack up by Marchambone June 12, 2022

slack-up 

An offline, asyncronous Stand-up, done on Slack, where each member in a team posts their own update.

Useful for remote teams.

John and Marie are working from home today, and John's connection is crap, so let's do slack-up.

slack-up by The Real Mr Fish January 9, 2018

snack up the jet 

When a rapper commands someone to adequately provision his jet with the appropriate amount of snacks for the journey.

"Hey Bitch, you better snack up the jet proper this time."

snack up the jet by T.I.. December 20, 2008

sack up 

Stop being such a pussy

You need to sack up instead of crying about your pussy hurting. (see also wah my pussy hurts.

sack up by jaydawg May 27, 2004