Bilge
Nonsense, or foolish talk. The lowest part of the ship, bilge water is the foul, brackish sea water that would collect from seepage in this area.

Black Jack
A leather tankard, made stiff with a coating of tar, used by dockside pubs and taverns to serve wine and beer.

Black Spot
Placing a black spot on another pirate means sentencing him to death. It can also be used to accuse him of a serious crime before other pirates.
  Blimey!
An exclamation of surprise.

Booty
Goods stolen on a pirate raid.

Bosun
Boatswain; a petty officer.

Bounty
Reward or payment, usually from a government, for the capture of a criminal.

Bowsprit
A long spar that projected from the ship's prow.
 
         
 
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