Circle-jerk Definition

noun
Alternative spelling of circle jerk.
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(vulgar, slang) A group of males masturbating ("jerking off") together (with or without interpersonal contact)

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(vulgar, slang) A metaphor for any group activity performed for personal gratification.

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(drug user slang) A person who shares syringes when injecting drugs.
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verb
(vulgar, slang) To participate in a circle jerk.
Wiktionary