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