Wanker has similar meanings and overtones to American pejoratives like jerk,[2] jerk-off, and prick. One particular connotation is of someone self-obsessed or a show-off (usually male).[3]
That's not really it's meaning. It's a European word and it's sort of like just an cuss word. It's a word commonly applyed to americans lol. Like all americans are wankers...
That is what it originally was, but now it's more just like broad based term that can be used towards men, women, or whole classes of people.