Certain ceremonies require dumping a little bit of liquid, usually alcohol, onto the ground. It might seem wasteful, but it’s really a powerful symbolic act called a libation — and it’s worth every drop.
In ancient Greece, anyone could make a libation as a sacrifice in hopes that the gods would see it and be pleased. Today some people offer libations in memory of a loved one that has died. One sip for you, one for your homies, as the saying goes. Libation is also a joke term for an alcoholic drink, so you could make a cocktail and call it "a libation."