the rabbit died, phr. — Green’s Dictionary of Slang

the rabbit died phr.

[the test formerly used to determine pregnancy]

I am pregnant.

1977		(con. 1949) J.G. Dunne True Confessions (1979) 195: ‘You’re sure.’ [...] ‘Pretty sure.’ She forced herself to look squarely at him. ‘The rabbit died.’.
2000		‘Ho-boy’ Dara 🌐 Sure enough, the doctor reported the rabbit had died.