Used by Sasha Cohen's character Borat Sagdiyev in 'Borats Guide to America' - referring to the act of sexual intercourse with other men when asking the interviewee about his stance of gay people.
"In Kazakhstan we have men who say they are married, but in secret they do bung bung bung in other man anus.."
British slang for a bribe, a "deal sweetener" of sorts. The term is used within football corruption, transfer agents paying "bungs" and the managers that accept them.