Often used to describe a woman with large bountiful breasts. More commonly used to describe a woman who not only has large appealing breasts, but also has a beautiful face, bodacious hips, and an amazing ass.
Eh yo Chris, see that girl on near the bench press? She is fucking stacked! Damn Kevin, she is stacked.
In multiplayer gaming, Stacking refers to the deliberate unfairness of player/team strength resulting in 2 opposing teams with 'Pro's on one side, and 'noobs' on the other.
The term was born in total annihilation and continued through supreme commander, forged alliance and supcom 2 But could apply to any game with at least 2 teams. Stacking / Stacked
I logged in last night to play a game, only to realise the other team was stacked to shit, the host had allowed the stacking to go ahead so he wouldn't get killed.
OR
We had a few intensive Pro V Pro games, and decieded to chill out and take a break for a half hour. We stacked our team and rolled over some noobs for the lols.