What goes on outside those doors is none of their business.
The meaning was soon enlarged to include any place where travellers could be lodged or entertained, and also by transference the person who provided lodgings, and so one who goes on before a party to secure suitable lodgings in advance.
As the liquor goes on filtering through the bags they gradually get filled up with slime and sludge, and the clear liquor ceases to run.
Each one goes on a little differently but has very similar effects.
Sonic Angel Island - Sonic the Hedgehog goes on an adventurous trip to Angel Island.
