Like many idioms with little historical depth, the use of -fu has more to do with cultural themes than grammatical construction and meaning. The pseudo-word "Spring-fu" is a construction meant to allegorically refer to kung-fu that endows the scripting language Spring with the mysticism and complexity of a martial art --- something that requires dedication to master and has hidden benefits ("really cool ju-ju") if mastered. Consequently, the current definitions of the suffix -fu are inadequate to describe the cultural use of the suffix in this evolving context.