BFD is an acronym for "big f**king deal." It is a slang term used to indicate sarcasm or dismissal of something that is perceived as unimportant or insignificant. However, there are a few synonyms that can be used to convey a similar meaning. These include "who cares," "no big deal," "not a problem," "not worth my time," "whatever," and "no skin off my nose." These phrases are often used in casual situations to express apathy or indifference towards a particular topic or situation. While they may not be as explicit as BFD, they convey a similar sentiment.