Country Dictionary

Contradictory to belief, a wanker is not someone who masturbates.
A wanker is someone who is an idiot

Jack: Oh Matt's a right wanker ain't he?
John: Yeah, bloody hell I hate him
Matt: Cunts.

Wanker: An arrogant or pretentious person. Sometimes this word is used instead of resorting to 'Cunt' or 'Bellend'.

I always wanted to meet a Wanker, but then I met Brett.

n. English Slang - A fellow road user. see also asshat cunt fucktard

'Thanks for cutting me off, you wanker'
'A really great turn wanker'

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

Did you know Brad got fired again for stealing from the boss - what a wanker

Someone who beats off a lot or too much.

Man Jeff Martin is such a wanker. He beats it like 3 times a day.

One who masturbates a lot and/or thinks about the act of masturbating a lot has Wankeritis.

I'm sure John has Wankeritis as he's told me that he masturbates at least eight times a day.

A man that enjoys masturbation also a common insult.

Don't be such a wanker!