Green’s Dictionary of Slang

(S.Afr. gay) an abortion.

2003		K. Cage Gayle 52/1: Abigail [...] abortion (She doesn’t know who the father is and has decided to have an Abigail.) [Western Cape, 1950s].
2023		R. Milward Man-Eating Typewriter 335: [T]he tarts did not seem molto eager to let me peform a backdoor abigail.