A mature cheddar head is someone who is very mature but acts really stubborn and stuck-up with it, quite snobby. They are mature in a really boring way with no sense of humour and take everything seriously.
'Sophie told me making fart noises is immature.'
'Don't worry, she's a mature cheddar head with no sense of humour.'
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Extra Mature Cheddar refers to 'old money' that has been in a family for a minimum of 6 years. If somebody's ancestors inherited the family fortune, they're classed as an extra mature cheddar family.
βHow do all of his relatives own 6 Lamborghinis and 2 islands?β
βHe's extra mature cheddar.β
Mature cheddar is slang for "old money". If somebody inherited their fortune, they are classed as mature cheddar.
βHow did you manage to buy half of Switzerland and a Gucci handbag?β
βI'm mature cheddar.β