I imagine this word passed out of use in part because of the shift from a rural predominance to an urban and suburban one in this and other English-speaking countries. Not something I've ever come into contact with, or am likely to, I'll bet.
afterings, n. pl.
Obs. or dial.
1. The last strainings of milk from a cow. dial.
2. Remaining dregs, after the main part is exhausted. Obs.
Listening to: Carla Vallet - Fantasie Sign