Strands #262 “For Our Furry...
Quizzes & Puzzles1 min ago
No best answer has yet been selected by georgeous. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.It's obviously been around in speech for longer, but the earliest recorded use of 'innit' in writing dates back only to the late 1950s. I'm not sure why you feel it doesn't make sense, as it is just elision of the underlined letters as follows: is not it and a duplication of the 'n' to distinguish it from 'in it' and to indicate that it is pronounced as in 'winning' rather than as in 'dining'.
'Man' has been used as a mode of address for centuries, but - as currently used - I imagine it to be of West Indian origin.
(I like the Eskimo reference, C!)