In the UK, to have a pint means to have some beer with some mates. Could be a proper pint, could be a half-pint (unlikely), could be several pints, could be one or more twelve-ounce bottles. The usage appears to be catching on in the U.S., as witness:
“Beer guru picks the 10 best places in Michigan to have a pint.” Headline, Detroit Free Press, May 21, 2012
“Bethel Woods hosts its annual Chili Day in October, a chance to head out, grab a pint, grab a wooden spoon and go to town.” Middletown [New York] Times Herald-Record, September 29, 2011
“The Union pawning [Danny] Califf lifts his six-figure salary off the books but it also removed one of the few outspoken personalities in the locker room. Califf was a leader as much on the field as off, visiting hospitals and reading books at schools and known to have a pint or two with supporters.” Philly.com, May 17, 2012.
The last item, about the Philadelphia Union soccer team’s trading a player, reminds me that I have been promised a guest post by a well-known authority about football (soccer) terms that have caught on these shores. Presumably, “supporters” (fans) will be included. I frankly don’t know if pawn is BrE for our trade. I look forward to finding out.