We found one dictionary that defines the word dad's day:

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1. Dad's Day: Wiktionary

Definitions from Wiktionary (Dad's Day) ▸ noun:  (informal) Father's Day ▸ Words similar to dad's day ▸ Usage examples for dad's day ▸ Idioms related to dad's day ▸ Wikipedia articles (New!) ▸ Words that often appear near dad's day ▸ Rhymes of dad's day ▸ Invented words related to dad's day