Wanker:
The term wanker originated from British slang in the 1940s.[1] Wanker literally means "one who wanks (masturbates)". In modern usage it is usually a general insult. It conveys contempt, not commentary on sexual habits. Wanker has similar meanings and overtones to American pejoratives like jerk(-off).[2] One connotation, implying egotistical and self-indulgent behaviour (and more analogous to American douche(bag)[3]), is the dominant meaning in Australia and New Zealand.[4]
"Wanker" hand gesture
Wanker may be indicated by a one-handed gesture,[5] usually to an audience out of hearing range.[2] It is shown by curling the fingers of the hand into a loose fist and moving the hand back and forth to mime male masturbation, which is equivalent to saying, "[you are a] wanker".