circle jerk

/S ER1 K AH0 L JH ER0 K/
noun
  1. 1

    A group of males masturbating ("jerking off") together (with or without interpersonal contact).

  2. 2

    Any group or group activity indulging in mutual gratification.

  3. 3

    An online community where a group of people form an echo chamber.

  4. 4

    (drug user slang) A person who shares syringes when injecting drugs.

verb
  1. 1

    To participate in a circle jerk

Source: https://en.wiktionary.org/wiki/circle%20jerk