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To fall over in a spectacular or amusing fashion, often to the immense amusement of the people around you.
I can't believe I stacked it up the stairs and passed out. I'm such a klutz.
by parlez February 21, 2005
to stack it is to fall over
james stacked it and broke his leg
by Jrace August 22, 2003
To bring or pile something or a situation on.
So whats the going on withcha', just stack it!
by Demicci Deja Dior-Britt October 04, 2007