British slang for an "idiot", a contemptible person. Also, occasionally spelled "tossa".
I believe it is a politer form of "wanker," Am. Equiv. would be "a jerkoff."
Before the advent of waterborne sewage systems waste buckets were left on the corners of streets for collection. People used to toss the waste in the buckets sifting through it for valuable items: rings; watches; and broaches, very much like down-and-outers rummage through rubbish (garbage) bins in affluent areas today. The sheer ghastliness of shifting through human excrement meant that the term 'tosser' conjured up depravity and poverty, and it was a very bad insult indeed. For more detail read 'At Home' by Bill Bryson
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Because you're a complete tosser for asking.
No, but sometimes "average" means "mean" - when it doesn't mean median, geometric mean, or something else entirely.
The answer will depend on who you mean by HE.The answer will depend on who you mean by HE.The answer will depend on who you mean by HE.The answer will depend on who you mean by HE.
See mean-8. Or get a dictionary.
There is no statistical term such as "deviation mean".