If there is a whole bunch of people in a vehicle, usually more than there is supposed to be, it's "Stacked Deep".
Anytime there is an excessive amount of people crammed into a small area, it can be described as "Stacked Deep"

"Them fools was "Stacked Deep" in that chevy."
"Yo, Nigga, that party was "Stacked Deep!"
"We was "Stacked Deep" in that mufuku!"
by JGSR March 21, 2006
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Five men, face up, stacked for their pleasure. It's hard to fall off this pile.
Chris invited his 4 friends over for a tournament style, deep stack.
by DaRealJuice May 5, 2017
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