There are two meanings to this acronym. One is the unofficial "British Broadcasting Company", but the official one is called "
Big Black Cock".
It is commonly used to refer to people who have big and black penises. BBC's are usually very attractive towards
white blonde girls and most gay men as it defines the word "Manliness". In order to have a BBC, you will first have to masturbate over 8 times a day as this creates friction that increases the pigment in your penis, which turns it black. The faster the rubbing, the better. Next, you will have to
get yourself some bitches in order to fuck and that creates even more friction that turns your cock even blacker (better). And there you go, you got yourself a BBC. Have fun!
-W