We found one dictionary that defines the word twinsie:

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1. twinsie: Wiktionary

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