The saying “Free beer tomorrow” is often used as a humorous way to advertise or promote something that is promised to be free but is never actually available. It is a play on words that highlights the skepticism and disappointment that can arise when people encounter promises that are too good to be true.

The exact origin of the saying is unclear, as it has become a common phrase used in various contexts. However, it is commonly associated with bars and pubs, where promotions such as happy hours or free drinks are sometimes advertised to attract customers. In these cases, “Free beer tomorrow” is a tongue-in-cheek way of teasing customers with the promise of free drinks, knowing that they will have to return another day to claim the offer.

Overall, the saying has become a humorous way to express skepticism or to point out unfulfilled promises in a lighthearted manner.