bung (Noun) — A plug used to close a hole in a barrel or flask.
bung (Noun) — Payment made to a person in a position of trust to corrupt his judgment.
bung (Verb) — Give a tip or gratuity to in return for a service, beyond the compensation agreed on. ex. "Remember to bung the waiter"
bung (Verb) — Close with a cork or stopper.
bung (Verb) — (informal) put, throw.