DFP is a jocular acronym invented by CrawfordCurrie and MichaelSparks. It stands for "Delete First Programming", and is meant to convey the semi-serious idea that code improvement can often be best achieved through the following steps:

1. Understand the spec that the existing code implements (not what it is supposed to implement, what it actually implements),
2. Delete the existing code,
3. Write new code to the reverse-engineered spec.