"Though mere yards from the still 'fantoosh' Sauchiehall Street, Cowcaddens seemed virtually a separate town, but many were lured across the uninviting Renfrew Street frontier to this grimy area. Its proximity to the fancy shops and variety theatres meant a mixed clientele in a quarter noted for its neds, nyaffs and all the 'hooks, crooks and cosmic singers o the day.'" - 'Glasgow's Favourite Dish', John Macleay in The Scots Magazine, Mar 2000.
"Though mere yards from the still 'fantoosh' Sauchiehall Street, Cowcaddens seemed virtually a separate town, but many were lured across the uninviting Renfrew Street frontier to this grimy area. Its proximity to the fancy shops and variety theatres meant a mixed clientele in a quarter noted for its neds, nyaffs and all the 'hooks, crooks and cosmic singers o the day.'"
- 'Glasgow's Favourite Dish', John Macleay in The Scots Magazine, Mar 2000.
The Urban Dictionary has a definition of nyaff.