Definition of "buggering"

I have just narrowly avoided having a buggering.

1987, Bruce Robinson, Withnail and I

[…] you look at the videos you brought down from the bedroom. Some feature the gang-buggerings of children; mostly male and mostly Asian or South American. Others show women being mounted by donkeys and other animals, in what looks like a prison.

1993, Iain Banks, Complicity