"A Project Object Model or POM is the fundamental unit of work in Maven. It is an XML file that contains information about the project and configuration details used by Maven to build the project."
He was making a joke about misreading 'pom.xml' as 'porn.xml' (all caps: 'POM.XML', 'PORN.XML'). I guess the issue works both ways for those more used to seeing maven projects than pornography!
You'll see this on lots of JVM-based projects.