We found one dictionary that defines the word grownies:

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1. grownies: Wiktionary

Definitions from Wiktionary (grownies) ▸ noun:  (childish) Grown-ups. ▸ Words similar to grownies ▸ Usage examples for grownies ▸ Idioms related to grownies ▸ Wikipedia articles (New!) ▸ Popular adjectives describing grownies ▸ Words that often appear near grownies ▸ Rhymes of grownies ▸ Invented words related to grownies