Where a male is subjected to extreme arousal far exceeding the point of "blue balls" syndrome.
Guy1 - "Dude, I was trying to have sex with my new girlfriend last night, and instead I got blue balls."

Guy2 - "You think that's bad, I got a purple boner just watching you both through the window."

Example 2: "Hey Mom, tell grandma to stop wearing that dress. She is giving me a "Purple Boner."
by Raging Wop June 30, 2010
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