Abbreviation for "Programmer as a Personality" (wordplay on other programmer related terms such as SaaS).
It is used to refer to a person (often new to programming/been learning for a shorter
time) who does not really know programming but just enough to take part in discussions and use things they
heard but have no real experience of as arguments to look like they know what they are
talking about.
They are usually more bothered with using the "correct" technologies (based on what
popular personalities use) and that their developer environment looks good so they can show others and thus look like they know what they are doing to other PaaPs or non-programmers.