When a person is so fat he or she has six stacks of fat or six layers of fat stacked. The opposite of six pack abs.
- David eats so much he has a six stack.

- Dude you're growing a six stack.
by x_X_CerealKiller69_X_x June 18, 2011
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A brazillian six stack is when 6 people pile their own cum on top of each other and pour it into the victim's mouth.
Jeremy: How have you been lately tom?
Tom: Well last Saturday me and my roommates formed a brazillian six stack!
by TheBanger27 February 26, 2017
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