From Urban Dictionary:
Detash: An alteration of "destash," which means to clean out your accumulated crafting supplies and pass them to others. This is usually accomplished by selling the supplies at bargain price. Used mostly among crafters on etsy.com. Not to be confused with "destache," which is to remove a mustache (and we wouldn't want to do that!).
I've put up some various purse making supplies that I no longer need. The new bags are not quite ready for their big debut but enjoy 10% off the vintage and detash items in the shop.