What it means
Means something is excellent, spot on, or just gone better than expected. You can use it as a quick verdict on anything from a bargain to a plan that actually worked. It is not about peppermint or the little sweet, it is pure approval. Often dropped at the end of a sentence, like a neat full stop. Heard loads up north and in laddish mate chat.
Usage examples
"Picked up new trainers for fifty quid, and they chucked in free socks. Mint. Let's nip for a pint and show them off."
"They bumped us to the front row for free and the band played every song we wanted, so honestly the whole night was mint."
Where it comes from
Comes straight from mint condition, the collector phrase for a coin or card so fresh it looks like it just left the press. Northern England shaved it down to a one-word verdict, so now anything top-notch is simply mint.
Other ways to say it
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