Big Fat Negative (BFN)
Definition - What does Big Fat Negative (BFN) mean?
A big fat negative (BFN) is slang term used to convey disappointment with a negative result on a pregnancy test. This result means that the test taker is not pregnant.
FertilitySmarts explains Big Fat Negative (BFN)
Big fat negative is a term that has become popularized in infertility and trying to conceive (TTC) discussion boards and blogs. The disappointment of a negative result on a test, especially when there has been a significant effort in trying to conceive, can be difficult news to accept and even more difficult to share.
Referencing a BFN can feel like a more detached, and therefore less disappointing, way to communicate to "I am not pregnant."