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It depends on what context we're talking about.
"BBC" in pornography, sexuality or sexual behavior means "Big Black Cock", which is used to describe a large African-American penis lol. That's quite straightforward.
Now, "BBC" also stands for British Broadcasting Corporation, which is a channel in Europe (here in the United States if you pay for it) and it broadcasts British news for the most part (and worldwide headlines.) It's just a news station.
As you can see, "BBC" can mean two entirely different things lol.