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.