Dictionary.com
Thesaurus.com

short jenny

British  

noun

  1. billiards an in-off into a middle pocket Compare long jenny

"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

Etymology

Origin of short jenny

from Jenny, pet form of Janet