1 definition by the urban dictionator
when you are on a pub crawl with your mates and halfway to the next pub you need to take a piss.This triggers a chain reaction between all your mates who decide they all need a piss too thus causing a brow flow.
"man i cant hold on til the next pub im gonna nip in these bushes for a piss." "yeah me to man" "wow i think were having a bro flow moment"
by the urban dictionator August 3, 2009