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3.
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
 
1.
to stack it is to fall over
james stacked it and broke his leg
by Jrace August 22, 2003
 
2.
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