Used traditionally on a Sunday when someone is being a buzzkill and refuses to get involved and continue boozing, claiming that they are too hungover.

When this happens a senior member of the group of mates calls the offender and enforces the follow on.

Stems from the cricket term 'enforcing the follow on', where a team must bat twice in a row because of a poor first innings.
'Hey mate, we are heading to the espy in an hour. Get a vibe and come down for a few throat charmers'

'Nah mate, got too over refreshed last night, I'm battling.'

'Sorry mate, I'm going to have to enforce the follow on.'
by Robbie-M October 25, 2011
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