- (slang) A group of males masturbating ("jerking off") together (with or without interpersonal contact).
- (slang) Any group or group activity indulging in mutual gratification.
1990, Camille Paglia, Sexual Personae:
- This is Melville's real heaven, an all-male platoon, each with his hand in someone's pocket. The circle jerk is another Romantic uroboros.
- (drug user slang) A person who shares syringes when injecting drugs.
- (Internet slang) An online community where a group of people form an echo chamber.