Slang for temporary testicular pain caused by prolonged sexual arousal without release, or plural of blueball plants.
Plural of 'blueball.' The slang meaning became common in 20th-century informal English and is based on the false belief that the condition causes actual blue discoloration.
Despite decades of use in slang, doctors say 'blue balls' isn't actually dangerous—it's just uncomfortable pressure that goes away—but the phrase is so vivid and memorable that everyone thinks it's a real medical emergency!
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