Garr
An expletive describing frustration, disappointment, upsettedness, etc. "Garr...I lost my keys again."

Gibbet
A wooden frame from which dead pirates were hung, often in a metal cage especially fitted for the pirate, as a warning to any others who would think of taking up a career of piracy.

Grog
Generically, any alcoholic drink. Specifically, rum diluted with water to make it go farther.

Hands
The crew of a ship; sailors.
  Handsomely
Quickly. "Handsomely now, men!" = "Hurry up!"

Hold
A ship's store-room

Jack Ketch
The hangman. To dance with Jack Ketch is to hang.

Jack Tar, or tar
A sailor.

Jolly Roger
Pirate flag, usually red or black and decorated with skulls, crossbones, and swords. Each pirate had his own design.
 
         
 
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