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!"
An awesome australian band that consists of 3 sexi boys named Bradie Webb(19, a very good drummer), Andrew Clemmensen(21, kick ass bass player and back up singer) and Shaun Diviney(20, best guitar player and singer)
Person 1: hey, have you heard that band short stack?