Etymology
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bullpen (n.)

also bull-pen, 1820, "pen or enclosure for bulls," from bull (n.1) + pen (n.2). Baseball sense "area where pitchers warm up before entering a game" is from 1915, perhaps from earlier slang meaning "temporary holding cell for prisoners" (common in American Civil War camps). Bullpen also was the name of a baseball-like game played in U.S. late 19c.

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Definitions of bullpen

bullpen (n.)
a place on a baseball field where relief pitchers can warm up during a game;
bullpen (n.)
a large cell where prisoners (people awaiting trial or sentence or refugees or illegal immigrants) are confined together temporarily;
Synonyms: detention cell / detention centre
From wordnet.princeton.edu