Could you tell me the meaning of "lost" here?
"Lost" in this context means to be confused or to not understand something. Jake is telling Finn that he doesn't understand what Finn is trying to say to him. Here are a few more examples of "lost" being used in the same context. Ex: I'm reading the directions on how to use this new blender and I am totally lost. Ex: She's lost on where to start cleaning. Ex: I'm lost. Can you repeat what you just said?