half gaff is a Scottish term used to describe a party that has a smaller number of people than a usual one.
Half gaff is defined in the Scottish slang folklore as a party with not enough people to call it a full party. For example a 'party' with under 20 people would be defined as a 'half gaff'.
'Thought it was going to be a full on party last night man?'
'Nah not enough people had to be a half gaff bro.'
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