This word is used very often in the North East of England. Especially by teenagers on the streets and chavs. It's basically just used as a substitute for words meaning cool, class and ace.
thats proper mint that!
woahh man thats mint as!
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An expression that, in terms of classifieds advertising, has lost all meaning.
Trying to sell my <item>, used only a few times... in mint condition!
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If something is a mint, it makes a lot of cents, or in this case sense.
*after explaining something*
reply: Woah bro ok thats a mint!