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

stack up 

To get a fuck load of money

I know i'm going out soon so till then fuck it im winning so im gonna stack up

stack up by Dylan69 April 5, 2008

Stack Up 

A dish of culinary precision loosely related to a casserole involving stacking the ingredients of a traditional Frito Pie in an upwards fashion. Stack ups can also be referred to as "spicy rice." Believed to have originated in the American Southwest.

I like Frito Pies, but I want more ingredients, so I'll make a Stack Up.

Stack Up by ronnic213 June 12, 2009

Stack Up 

In reference to how police/SWAT teams will "stack up" when entering a building, it is a challenge to government officials and law enforcement agents to personally and physically enforce gun control legislation. Most commonly used in libertarian/anarchist Twitter circles when responding to pro-gun control politicians, similarly to "Molon Labe"/"Come and Get It"/"Come and Get Them".

"You want my guns? Stack up!"

Stack Up by indianarchist June 8, 2022

Stack up or fuck off 

Similar to ‘ Come and take it’. It’s an invitation for the individual person(s) who doesn’t like guns to attempt a seizure of the guns owned by the user of the phrase, in essence, ‘either do something or shut the fuck up’

“We’re coming for your guns, those don’t belong in society”, “ If you want them so bad then why don’t you stack up or fuck off”

Stack up or fuck off by Marchambone June 12, 2022

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

Stack up before you stock up. 

To prioritize earning or saving money over spending it.

Saving a substantial amount of money to invest.

If I want to get something nice for Christmas, I have to start stacking up before I stock up.

If you want to make good money buying shares, you have to stack up before you stock up.

Stack up before you stock up. by ErKTM November 19, 2021