1. "fucking bitch"; usually used as a curse/exclamation. Sometimes used as a hashtag by users on Twitter, www.twitter.com
2. Social networking site Facebook, www.facebook.com
Ted: "Stubbed my toe on the corner of my desk >:( #fb"
Rob: "Hey man, are you on fb? You should add me."
Ted: "Whoa, hey, did you see Rob's profile pic on fb?"