"pregnant," Australian slang, 1951, from pregnant (adj.1). Compare preggers.
Entries linking to preggo
pregnant adj.1
"with child, impregnated, that has conceived in the womb," early 15c., from Latin praegnantem (nominative praegnans, originally praegnas) "with child," literally "before birth," probably from prae- "before" (see pre-) + root of gnasci "be born" (from PIE root *gene- "give birth, beget").
The word tended to be avoided in polite conversation until c. 1950; modern euphemisms include anticipating, enceinte, expecting, in a family way, in a delicate (or interesting) condition. Old English terms included mid-bearne, literally "with child;" bearn-eaca, literally "child-adding" or "child-increasing;" and geacnod "increased." Among c. 1800 slang terms for "pregnant" was poisoned (in reference to the swelling).
preggers adj.
"pregnant," 1942, British slang, from pregnant (adj.1) + ending as in bonkers, crackers, starkers. This seems to be an expanded version of -er (3), the suffix used to make jocular or familiar formations from common or proper names (as in rugger for rugby, and soccer).