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1.
Two bisexual chicks, one laying on the bed, and the other laying on top of her, face to face, making out. This provides a convenient and pecker pleasing cunt stack for the man to alternately tap on at his penis tingling leisure.
Once I started to cum, I hugged the Olsen twins very tightly around the waist and popped back and forth from one twat to the other for about 6 cum blasts apiece. It was the best cunt stack I ever fucked!
by Mike Bozdog June 19, 2006
 
2.
A cunt to the power of ten. When the word cunt alone absolutely won't cut it, cuntstack is a level up.
You're a fucking cuntstack.
by fizzypixels December 23, 2007
 
3.
A orderly arrangement of cunts
usu. along a vertical line
George Bush is a cunt stack
by simon March 11, 2004