It's a cure used to fix weed you harvested too soon and didn't flush properly OR if your stash is depleted and you don't want to wait for months for a proper cure.
Soak it in water for a week, changing the water GENTLY every day. Trichomes can break off.
Spin dry it in a salad spinner and spread it over a window screen or similar to dry. The smoke will be much smoother but the buds won't smell as good as a good cure.