Resembling, tasting like, or containing qualities of grapes; having a grape-like flavor, appearance, or scent.
From 'grape' plus the suffix '-y' (meaning having the quality of, or full of). The '-y' suffix is one of the most productive in English, turning nouns into adjectives (rainy, snowy, cloudy, fruity).
The '-y' suffix is so productive that English speakers constantly create new adjectives on the fly—'that's very nutty,' 'the weather is kind of humid-y'—and many stick around as legitimate words. Grapey is a perfect example of how transparent and useful this suffix is.
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