We found one dictionary that defines the word drinks o'clock:

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1. drinks o'clock: Wiktionary

Definitions from Wiktionary (drinks o'clock) ▸ noun:  The time to begin social drinking. ▸ Words similar to drinks o'clock ▸ Usage examples for drinks o'clock ▸ Idioms related to drinks o'clock ▸ Wikipedia articles (New!) ▸ Words that often appear near drinks o'clock ▸ Rhymes of drinks o'clock ▸ Invented words related to drinks o'clock