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1. An abbreviation for "Facebook." Oh, those two are dating now—she posted about it on FB. I liked his picture on fb, so I don't know why he thinks I'm mad at him.
2. An abbreviation for "follow back" that is typically posted as a comment on social media, encouraging other people to "follow" them on the site or app. When someone writes "FB" on one of my posts, it makes me never want to visit their page. LOVE this dress! FB
fuck bunnyand FB
n. someone who just loves to copulate. (Usually a female. Taboo. Usually objectionable.) She’s a real fuck bunny, isn’t she?
See fuck bunny