Definition - What does Big Fat Positive (BFP) mean?
A Big Fat Positive (BFP) is a slang reference to a positive result on a pregnancy test. A positive result on pregnancy test indicates that the test-taker is indeed pregnant.
FertilitySmarts explains Big Fat Positive (BFP)
The term 'big fat positive' is used in online infertility/fertility circles and is found frequently on fertility blogs and websites. A BFP is used as a happy indication that pregnancy has been achieved.
Many who use the term have been trying very hard to get pregnant, often for a long time, and they have finally received that much-anticipated verification of a positive result.
A related term, big fat negative (BFN), indicates that the test-taker is not pregnant.