Abbreviation for 'The Haystack'...a slang term for the city of Hayward, California in the Bay Area.
"He's from the 'stacks".
by Jack-D May 19, 2009
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To fall down or crash whilst on bicycles, scooters, scateboards, etc.

Australian colloq.
hey mate, did you see that guy who fully stacked it on his bike the other day?
by iamewy January 30, 2009
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Did you catch that chick on 34th and Main? She was stacked!
by DDDDDD March 04, 2002
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