Used to describe some skill or ability that one excels in.

Originally coined by Ralph Wiggum of the Simpsons, saying "Sleep! That's where I'm a viking!" While obviously meaning that he is a viking in his dream, it has been reinterpreted by nerds to mean that Ralph excels at sleep, and describes himself as a "viking" in that field.

Most often used by Dungeons and Dragons nerds to describe a particularly high stat.