The phrase "got lather" often refers to getting oneself worked up or excited about something. There are many synonyms that can be used instead of "got lather", depending on the context. Some possibilities include "fired up", "energized", "sparked", "animated", "enlivened", "ignited", "passionate", "frenzied", "excited", "exhilarated", and "thrilled". Each of these alternatives provides a slightly different shade of meaning, but all convey a sense of heightened emotion or enthusiasm. Choosing the right synonym can help to add nuance to a phrase and make your writing more evocative and engaging.