noun
a slang term referring to someone's energy, enthusiasm, or feistiness
conjunction
used to connect the two nouns 'piss' and 'vinegar' in the phrase
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The young man's energetic demeanor is often attributed to his youthful exuberance and spirited nature.
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That guy is always full of piss and vinegar, never a dull moment with him around.
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She's got so much piss and vinegar, she could outlast anyone on the dance floor.
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Despite his age, the old cowboy still has plenty of piss and vinegar left in him to tackle any challenge that comes his way.