The term nippy has nothing to do with nipples. Nippy means chilly or cold; sharp or biting; tangy. It has its origin in the 16th century (1565-1575) from the word "nip" which means to squeeze or compress tightly between two surfaces or points; pinch; bite; a biting quality, as in cold or frosty air.
Learn more about the word nippy by checking some examples (contemporary and historical) at Dictionary.com. You can also find synonyms for nippy with free online thesaurus, antonyms, and definitions at Thesaurus.com
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