A hockumentary is typically a Canadian phenomenon. The canadian penchant for the Hockey Documentary is legendary. Of course there are the typical documentary's about the big names, like Wayne Gretzky and Bobby Orr, but these are fairly pedestrian. Others border on fanantical, like "Life After Hockey" or "Shinny: The Hockey in All of Us".
Holcrum is what you call someone when someone else mispronounces their name. You can call them holcrum instead of their real name just to tease them. If someone says yo, instead of Joe, you can call them holcrum as a joke.