BMI of 26.3 as of today (6'4 216 pounds)
I'm not the leanest right now but I'm nowhere near overweight from a medical standpoint, and I don't think anyone would call me fat. Height does tend to skew BMI slightly (since it's weight divided by the height squared, and we humans are kind of three dimensional, so using a factor of height cubed instead should more accurate, and even then it doesn't work perfectly, as the proportions of a tall person vs a short person is slightly different). As a result of that, BMI is larger than it "should" be for taller people and smaller than it "should" be for shorter people.
Plus I have lifted weights on a regular basis for almost 3 years, so I should expect (or at least hope for) a larger amount of muscle mass than your average sedentary individual.
Does make me lol if an average/short person with a BMI of >30 claims that it's "all muscle" though