A common method of getting home after a long night on the turps. Essentially means walking, however the state of intoxication means that you will usually have no recollection of the journey on the beer bus, but will instead wake up wondering how you got home, undressed and into bed.
Riders of the beer bus may also wake up with a memento of their travels, possibly a traffic cone or road sign.
Jono: How'd you get home last night mate?
Chris: Oh I just caught the beer bus, got home about 4.
The beer bus is the bus that mysteriously comes to a bar late in the evening while you're in the bathroom and drops off a busload of sexy girls and takes away all the ugly girls.
After 10 beers Dave staggered back from the bathroom and declared that every girl in the bar was a fox. The beer bus had arrived!