Dictionary.com
Thesaurus.com

goolie

British  
/ ˈɡuːlɪ /

noun

  1. slang (usually plural) a testicle

  2. slang a stone or pebble

"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

Usage

This word was formerly considered to be taboo, and it was labelled as such in previous editions of Collins English Dictionary . However, it has now become acceptable in speech, although some older or more conservative people may object to its use

Etymology

Origin of goolie

from Hindustani goli a ball, bullet