ETYM Cf. w. bwng orfice, bunghole, Irish buinne tap, spout, OGael. buine.
Plug used to close a hole in a barrel or flask; SYN. spile.
The stopper especially in the bunghole of a cask; also; bunghole.
The cecum or anus especially of a slaughtered animal.

1. To plug with or as if with a bung
2 British; throw, toss