Green’s Dictionary of Slang

loutish; thus yobbishness n.

1969		N. Cohn Awopbop. (1970) 175: It was a reaction against the yobbishness of the Teds in the fifties.
1999		Guardian Weekend 18 Sept. 43: The slightly yobby, up-yours [...] comfort-weating control freak.
2000		T. Blacker Kill Your Darlings 232: Men in big suits and sharply styled yobby haircuts.