What is circle jerk definition in english?

A circle jerk is a slang term that describes a sexual act involving a group of people (typically men) sitting or standing in a circle, each person manually stimulating the next person's genitals until they reach orgasm. It can also be used as a metaphor for a situation where a group of people engage in self-congratulatory behavior and reinforce each other's opinions, without any real critical thinking or diversity of perspective. It is generally considered a crude and offensive term.