Rigour? Hmm. But I think that good cases have been made above for skank, shag, rock and roll ... I think that comparisons with 'underground' words which are known to have been infiltrated into the mainstream [see my last post] make academic rigour a bit tenuous, & precise citings unlikely.

However, I don't think anyone but you, Nigel, has introduced any concept of 'research' being underway here. Anyone out there collecting material for their PhD thesis?

I thought not.

~M~