Refering to all brachycephalic dogs who can be medium to large in size, well muscled, usually conformationally square and with a short stiff coat of any color.
I went to the park with my bully boy and everyone there stared at him, some came up and asked if we were going to have pups for sale.
Usually referes to:
Olde English Bulldogges
Olde Boston Bulldogges
American Pit Bull terriers
Various Mastiff breeds...
And other mixed breeds with a heavy Bulldog iunfluence.
Examples can be seen at www.rockroll.com