Sometimes called "Bed n Breakfast."
In "x01" dart games (such as 301), a score of a single 20, a single 5 and a single 1, for a total of 26 points.
The phrase originated in the distant past, when the standard rate for a bed-and-breakfast in England was 2 shillings and 6 pence ("two and six").
After a few pints, Chauncey was trying to close his twenties, but all he could manage was breakfast.