When a thing or situation is so good that lesser adjectives can't possibly explain how good it is. Particularly if it's to do with cars, drugs, music or other non mainstream sub culture things and events. Similar to a Chef's kiss of excellence.
Whilst off chops at a music festival Gary turned to Shane and said; "fuck, these Mitsubishi's are fucken mint!"
the limited production of sweatshirts made by kanye west for kim kardashian. Only 50 were made and given to the Kardashians closest family members and friends
did you see that “mango mint” on that hot chick. what a lucky bitch