Blue-ball
Definition
Blue-ball is a vulgar slang verb meaning to leave someone—usually a man—sexually frustrated by denying them an orgasm or abruptly ending sexual contact. It can also mean teasing or leading someone on by promising something desirable without delivering it.
Quick Facts
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What does blue-ball mean?
To blue-ball someone is to leave them sexually frustrated by denying them an orgasm or abruptly ending sexual contact. The expression is usually applied to a man and is vulgar, idiomatic slang.
The verb can also be used more broadly for teasing or leading someone on with the promise of something desirable, then failing to deliver it.
How blue-ball is used
Blue-ball is a transitive verb, so it is used with a person as its object: someone can blue-ball another person, or be blue-balled. In sexual contexts, the phrase describes frustration caused by an interrupted or denied sexual encounter.