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.
by ErKTM November 19, 2021
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A widespread drinking game popular among college students. Rules are complex but well known. Play involves, among other things, marshmellows, wine, and the film Mean Girls.
Hey man I'm looking to get schwasted... care to play Stack 'Em Up?

SEU is the best game ever!!
by UVAforLIFE April 5, 2012
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Ima hustle hard to get a shit ton of money in a short amount of time to do whatever the fuck I wanna at that time at it greatest potential
I’m taking a trip to Cali next month, it’s time to stack the fuck up
by Imperial Princess December 31, 2020
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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!"
by indianarchist June 8, 2022
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