the female equivalent to blue balls (i.e. unfulfilled sexual pleasure from or after being sexually teased).
That hot guy gave me such a purple onion when he bent over.
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When you punch a girl so hard in the vagina that it turns purple and she cries.
That ugly bitch tried to rape me so I gave her a purple onion.
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A vagina of African descent.
Jake: "hey man, I finally had sex with a black girl"
Chad: "so you finally got some purple onion?"
Jake: "what?"
Chad: "yea, man didnt you look down while you were getting it in?"