"Falsifiable predictions" refers to statements or predictions that can be proven wrong or proven false. In other words, these are statements that can be tested or observed and have the potential to be shown as inaccurate or untrue. Full definition
The strength of a scientific theory is related to the diversity of phenomena it can explain, which is measured by its ability to make falsifiable predictions with respect to those phenomena. (religion.blogs.cnn.com)
If the Bible were such a book, it would make specific, falsifiable predictions about human events. (nakedpastor.com)
I'll make a simpler, and sooner falsifiable prediction, one that can be shown wrong by September or October of this year. (dotearth.blogs.nytimes.com)