Originally a nautical term, Bristol Fashion means "conforming to the highest standards of seamanship." A boat that is maintained in absolutely perfect condition can be described as "shipshape & Bristol Fashion."
The term is frequently applied outside the boating world, however. A cooler stocked with ice cold beers, an old truck that's been tuned to run just right, a steak cooked perfectly, or an immaculate lawn could all be described as being in Bristol Fashion.
"Have you seen Old Man Nelson's lawn? That guy keeps his yard in Bristol Fashion."