bung

An illicit payment or bribe, often given secretly.

"He offered a bung to the official."

A stopper or plug, especially for a barrel or cask.

"He hammered the bung into the barrel."

To stop up a hole or opening with a bung.

"Bung up the hole before it leaks."

To throw or put something somewhere quickly or carelessly.

"Just bung it in the bin, mate."