While Jordan Belfort was in prison for securities fraud, he began writing the book that would become Martin Scorsese's Oscar-nominated movie. This story first appeared in the March 7 issue of The Hollywood Reporter magazine.
Freebase(0.00 / 0 votes)Rate this definition: In baseball, the bullpen 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.
bullpen(Noun) An enclosed area used to hold bulls. Magnus and Big Buck are over in the bullspen, ready for tonight's rodeo. bullpen(Noun) An enclosed area for pitchers to warm up in during a game. After that hit, there is activity in the bullpen.