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1.
When a female demonstrates balls, or guts, it is said she has girl balls so as not to sound awkward.
"that girl has, what's the word?"
"girl balls?"
"yeah, that's it."
by DJ Dogman December 11, 2006
 
2.
Ovaries. A woman's gonads. The pair of female organs homologous to the male's testes.
You're being a real pain in the girl balls.
by Dr. Turbo April 06, 2010
 
3.
Synonym for breasts] or boobs].

Etymology: from boy-balls, or testicles].
"Wow, her girl-balls are SO fake."
by Stealth February 28, 2005