Probably something historical.

Someone found a protein, gave it a name (hypothetically: "biostars kinase": BK), describes it's functions and publishes it. A few months later, someone finds a protein which closely resembles BK, but we don't know anything about the function. We just know it looks like BK. So let's call it "biostars kinase like". Similar structure might mean similar function. BK-like is a pretty good name because it looks like a biostars kinase. We don't know it actually has a slightly different function. Perhaps Bioconductor Support Kinase or Stackoverflow Kinase would have been more appropriate, but renaming it now would give too much confusion and be a real pain in the elbow.

It can mean many things, but in general, it probably means that whoever made the annotation wasn't sure if it was X, so they just went with X-like.