noun Slang: Vulgar.
an arduous, often unpleasant task.
a person who makes great demands on others; taskmaster.
Also called ball-break·er [bawl-brey-ker] /ˈbɔlˌbreɪ kər/.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
slang a person, esp a woman, whose character and behaviour may be regarded as threatening a man's sense of power
Word Origin for ballbreaker
C20: from ball 1 (in the sense: testicle) + breaker 1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012