What is top burger?

From Bob's Burgers: a specialized burger served with a high-quality, seven-grain bun

"Hey Bob, what's the burger of the day?" "It's the Top Bun Burger, it comes with our best bun!"

Top burger - what is it?

The best place for fries in the state of Washington, though, they f*cked up a ruben sanwich with MAYO.

Girl: Hey, let's go to Mcdonalds and get some fries!
Guy: Hell no- Top burger's fries will murder those fries ten times over.