Despite having the word 'banter' in its name, someone described as a Bantersauross have no banter whatsoever. In fact, they are usually the brunt of the jokes.
The outward display of affection between two intimately friendly parties by extreme piss taking, savage in nature.
Usually characterised, and generally understood by the rule of thumb that the more offensive and deftly aimed that the ribbing is, the greater the respect or underlying fondness that exists.
"Sweet Jesus, Gwyneth! Your vagina is like a wizards sleeve!"
"Haha! Your twat-banter is on top form tonight Rupert."
And dying in yo' bed many years from now, would ya be willing ta trade all da days from dis here day ta dat fo' one chance, just one chance, ta come back here as young men an' tell our enemies dat dey may take our lives but dey will never take our freedom ... YUB NUB!