Dictionaries are often treated as the final arbiter in arguments over a word’s meaning, but they are not always well suited for settling disputes. The lexicographer’s role is to explain how words are (or have been) actually used, not how some may feel that they should be used, and they say nothing about the intrinsic nature of the thing named by a word, much less the significance it may have for individuals. When discussing concepts like racism, therefore, it is prudent to recognize that quoting from a dictionary is unlikely to either mollify or persuade the person with whom one is arguing.
An oggcast is a podcast recorded and distributed exclusively in the Ogg vorbis audio codec and/or other similarly free codecs.  For example, a podcast distributed both in the non-free MP3 format and the free Ogg Vorbis format would not technically meet the definition of an oggcast. In contrast, a podcast distributed in both the Ogg Vorbis and Speex codecs would meet the strict definition of an oggcast. The term oggcast is a combination of the word "ogg" from the term Ogg Vorbis, and the syllable "cast", from "broadcast".
This is a curious definition -- we would have said nonsensical, except that that would be rather judgmental -- because it does not require elements often associated with religion, such as deity, morality, world view, etc. Capitalism, homophobia, transphobia, President Obama's place of birth, and other beliefs might fit this definition. Also it requires that a person pursue their religion with enthusiasm. Many people identify themselves with a specific religion, but are not intensely engaged with their faith.