means Tasting, smelling, or feeling of mint — fresh, cool, and clean — or, by extension, describing something in pristine, near-new condition.

from From "mint," the herb, whose name traces back through Old English "minte" to Latin "mentha" and Greek "míntha" — and beyond that, possibly to a pre-Greek word, since Greek myth tied it to a nymph named Minthe whom the goddess Persephone trampled into the fragrant plant. The plus-"y" turns the noun into the adjective. The "like-new" sense ("mint condition") is a separate thread: it comes from the coin mint, where freshly struck money emerges flawless and untouched.