Phrase used to indicate that a woman is pregnant. The term originates from an early pregnancy
test. It was discovered
that when a pregnant woman's urine was injected into a female rabbit, the hormonal difference would result
in detectable changes in the rabbit's ovaries. Although
this form of testing was always
fatal to the rabbit, no matter
what the results were, the public somehow got the misconception that only a positive result
killed the rabbit.