Grog is an alcoholic beverage that can be consumed out of a Tankard by players during gameplay in Sea of Thieves. Grog can be found either from the Innkeeper or from the Grog barrel on board your ship.
Consuming too much will cause the player to become drunk; Enducing vomiting which can be collected in a bucket to be thrown overboard, or more preferrably, at a crewmate.
Being drunk also affects your abilities to perform ship functions such as being unable to stay on course or irregularly adjust the sail lengths. It also hampers instruments too, which songs are played out-tune due to your drunken stupor.
This drunkenness can be temporarily inflicted from a Grogball.