James Acaster goes on a lads night out, but he doesn't end up enjoying it. Lads are usually English young men together doing male things and generally being aggressive,. overly sexual, crude, rude and competitive. Heavy drinking, lots of peer pressure, chatting up girls, inappropriate things being said and done - basically just old fashioned sexism. To shag is to have sex with someone at the arse-end of the bar for example.