Wanker

[Britney]

a bloke who whacks off alot.
a term of endearment...an insult thats actually a kind of compliment
a total insult

[Couch Potatoe]

A complete tosser. Someone who makes
as little effort as they can possibly
get away with.
In British English thats what wanker
means - it does not literely mean
a masterbater (though doubt he is one).
Just as hes a bugger does not
literally mean he commits sodomy...

[PussyCat]

A commonly used Australian/british/new zealand word used to describe a fuckball, jerk, asshole or jackass.
Another word for tosser, which is usually reffered to when someone is being a tool or a complete dick. The term is usually asscossiated with one who masturbates regularly. Often reffered to as having a wank, hence the term wanker (one who wanks).

[Sonia]

Someone that thinks theyre cool but in reality is a total knob jockey.
A smug, satisfying real English term to call someone you intensely dislike without resorting to the word cunt!

[Donald Trump]

The other contributors are correct in the literal meaning of the word as one who masturbates, however in Australia, it is used more like a slightly more vulgar synomym for words like [fool] or [idiot]

[Rihanna]

A man that enjoys [masturbation] also a common insult.

[PussyCat]

While to [wank] means to masturbate, the term wanker is seldom if ever used in British slang to denote one who wanks. It is quite wrong to infer from somebodys being a wanker that they in fact wank (and vice versa), but of course, fair to assume they do in any case. Herein lies the genius of the insult: if you call someone a wanker, its probably true, but only literally.

I suppose it all originates from our repressed Victorian sexualities, from back when everybody thought they were the only ones to suffer the secret shame of being an actual wanker.

Most children these days learn the word wanker long before they learn its literal meaning.

[Raeanne Dimick]

A contemptible person (used as a general term of abuse).

[Britney]

[British slang] for an [idiot] or [fool]

[Julian]

UK/Aus/NZ slang for:

Someone excessively and annoyingly pretentious and/or false, with a strong likelihood of working in the creative industries, especially new media. Very high populations of wankers are to be found in certain areas of London including [Shoreditch] and [Hoxton]; see also [Shoreditch twat].

Someone with a faintly sociopathic lack of regard for other people; see also arsehole.

Someone useless, inefficient or time-wasting, especially in a place or work and/or position of responsibility.

A general term of abuse.

Someone who masturbates.

[Cami]

a very stupid or unpleasant person, usually a man