Crabs are as much a part of Baltimore culture as anything possibly could be. If you visit Baltimore, you MUST have some sort of crab dish complet with Old Bay seasoning. The common way to eat crabs is get a a dozen of steamed hard shell blue crabs with a mallet and lots of napkins, to be washed down with cold beer. Typically, the beer would be awful National Bohemian (Natty Boh, in local parlance) and the table would be covered in newspaper. But if you're willing to go a bit more upscale and you don't like to battle with the shells, crab cakes are another Baltimore tradition (you can even get them at Camden Yards). My favorite place to get them is at G&M's on the south side of the city near the airport where the crab cakes are as big as softballs!
If there's one thing Baltimore residents are passionate about, it's crabs. Crabs are to Baltimore what beer is to Munich or coffee is to Seattle. Prepared in any number of ways, you can be sure the crabs are delicious.
For the uninitiated, probably the two easiest ways to eat crabs are either in the form of crab soup, or in crabcakes. In both cases, the meat has been removed for you, so all you need do is enjoy the tender shellfish.
So be sure to try crab in some form when you come here. As some local wags say, "come to Baltimore and get crabs!"