We found one dictionary that defines the word Devil's buttermilk:

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1. Devil's buttermilk: Wiktionary

Definitions from Wiktionary (Devil's buttermilk) ▸ noun:  (informal) Whiskey. ▸ Words similar to Devil's buttermilk ▸ Usage examples for Devil's buttermilk ▸ Idioms related to Devil's buttermilk ▸ Wikipedia articles (New!) ▸ Words that often appear near Devil's buttermilk ▸ Rhymes of Devil's buttermilk ▸ Invented words related to Devil's buttermilk