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Holding cells were called "bullpens" because police officers were at the time called bulls. Bullpens are still the name inmates call holding cells. You are held in the bullpen at county jail until the bus takes you to court. At court you are held in another bullpen until you are called in front of the judge. Then you are escorted back to the bullpen and are held there until all the inmates are called in front of the judge. Then everyone is escorted back to the bus and sent back to county jail where you sit in another bullpen until you are escorted back to your housing unit.
Damn I sat in the bullpen for 8 hours today before I was called in front of the judge!
bullpen by ronmetrx1 July 1, 2011
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1. In baseball, the bullpen (sometimes referred to as just "the pen") is the area where relief pitchers warm-up before entering a game. Depending on the ballpark, it may be situated in foul territory along the baselines or just beyond the outfield fence.

2. It also refers to an office workspace populated with desks but no separating cubicles or walls.
1. Goose Gossage warmed up before the 7th inning and then went into the game to trounce whoever his team at the time (White Sox, Yankees, Padres or Mariners) happened to be playing.

2. Finch from Just Shoot Me works at the periphery of the bullpen, right outside his boss's door.
bullpen by 5150pacer March 20, 2008
in dating, this is a lineup of associates who specialize in your tastes. as in baseball the manager needs a starting pitcher, middle reliever and a closer. in dating, some people various have fetishes and tastes. a bullpen satisfies an individual's various sexual needs. a bullpen is also a good way to keep a man from becoming pussywhipped.
tom leykis tells all his sons avoid girlfriends and instead to keep a bullpen. he's a smart guy who knows everything men need to know in order to get laid.

Tom: Sometimes I'm a chubby chaser, sometimes I like asians, and sometimes I like MILFs. My bullpen has these types along with the hotties.
bullpen by Chris Norton February 6, 2009
A bullpen is a rotation of women started by Grant Sisk. The basics of the pullpen consist of the alpha female (#1) in the rotation, two supporting aces (#2 & #3) and two relievers (#4 & #5). The alpha female is the go to at all times, but if she isn't available, the skipper will move down the totem pole.

WARNING: IF YOU START A BULLPEN IT CAN CONSUME YOUR LIFE. ADVISE AGAINST STARTING A BULLPEN WHEN YOU HAVE A LOT ON YOUR PLATE
Hey, who all is in the bullpen now?
Bullpen by oneguytrain May 16, 2016
An event in DC where there’s typically a large crowd including drinking and partying.
Hey! Are you bullpen-ing today?
Bullpen by ChelleChelles April 13, 2026

Bullpen Therapy 

A practice that involves transporting prisoners back and forth needlessly from jail to jail or precinct to precinct. Named so because the cell looks like a bullpen, symbolically representing the fenced in area of a "bull's pen", where bulls wait before being sent off to the slaughter.
"Going from central booking in Downtown Brooklyn to Rikers Island is bullshit bullpen therapy!"
Bullpen Therapy by SomeOneNYCz February 19, 2010

Bullpen Catcher

1. A man whose woman prefers to fuck a dildo rather than actually fuck him.

2. A catcher that is hired specifically to warm-up professional pitchers in the bullpen. The bullpen catcher is not a member of the team and will never play in the actual game.
1. Earl has a baby dick. That's why his girlfriend would rather fuck her dildo instead of him.
2. The bullpen catcher warmed the relief pitcher up for the ninth inning.
Bullpen Catcher by stixy123 April 28, 2014