We found one dictionary that defines the word cold as a witch's kiss:

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1. cold as a witch's kiss: Wiktionary

Definitions from Wiktionary (cold as a witch's kiss) ▸ adjective:  (simile, colloquial) Very cold. ▸ Words similar to cold as a witch's kiss ▸ Usage examples for cold as a witch's kiss ▸ Idioms related to cold as a witch's kiss ▸ Wikipedia articles (New!) ▸ Popular nouns described by cold as a witch's kiss ▸ Words that often appear near cold as a witch's kiss ▸ Rhymes of cold as a witch's kiss ▸ Invented words related to cold as a witch's kiss