Wiktionary
n. The visiting of a number of public houses in a single session
WordNet
n. a tour of bars or public houses (usually taking one drink at each stop)
Wikipedia
Usage examples of "pub crawl".
The false theatrical beard Maybrick had obtained for him from a cheap shop in SoHo and the dye used to color it left Lachley as anonymous as the thousands of other shabbily dressed working men wandering Whitechapel, wending their way from one gin palace to the next on a drunken pub crawl.
The associated pub crawl involves travelling right round the tube circuit, stopping at each of the fifteen stations and walking to the nearest pub for a pint and a whisky (or a half and a half, if you're some sort of cissy).
We did a pub crawl halfway across the docks looking for you or your crew and my young friend imbibed pretty heavily.