The phrase "you're killing me" is often used colloquially to express frustration, annoyance, or exasperation towards someone else's actions or comments. In the context of a thesis statement, it may imply that the writer feels overwhelmed by the expectations or challenges involved in crafting a strong thesis. It suggests a sense of being pushed to one's limits, as if the process of developing a clear and compelling thesis statement is difficult or stressful.
If you meant a specific thesis statement that includes the phrase "you're killing me," please provide more context, and I can help analyze that statement more accurately!