Stands for "big name fan", as known on tumblr. Within a fandom, there are usually multiple people who are known fandom-wide and who have many more followers than other people. These people are known as "BNF"s.
by nbs June 05, 2013
man I just did cindy the cripple, when I was done I pushed her off the roof though because she was a bitch...twisted metal baby
by NBS May 23, 2006