Definition:
The “wanker” gesture is a well-known and highly offensive hand gesture primarily used in British and Commonwealth countries to insult someone. It mimics the action of male masturbation and is used to convey that someone is useless, or behaving in a ridiculous manner.
Etymology:
The term “wanker” itself comes from British slang and refers to someone who masturbates. Over time, it has evolved to broadly mean an idiot or someone who is ridiculous, useless, worthless, incompetent, contemptible or despicable.
Description:
The gesture is made by forming a loose fist with one hand, holding it with the palm facing inward, and making a repetitive, up-and-down motion with the wrist. This motion is intended to simulate the action of male masturbation.