Stash is a term quilters use in reference to their collection of
fabric.
Avid quilters are always buying fabric. They have this compulsion to own every shade of every colour and every pattern available. They buy a yard or a fat quarter of any fabric they think they might possibly one day put to use in a quilt.
There is an expression in quilting circles: "She who dies with the most fabric, wins."
For an example what part of a stash looks like, please visit:
http://members.nbci.com/_XMCM/denisehp/stashden1.jpg