Poa is a genus of grass that includes desirable species such as Kentucky Bluegrass, as well as species many would deem undesirable such as Poa annua and Poa trivialis. Based on your past posts, I think you mean triv? Cutting the tuffs is a bandaid and won’t kill it. The problem with triv, in my view, is that it grows faster than most “lawn grasses,” has a different color and texture. It goes dormant in heat but comes back in Fall and spring. So in the fall and spring it stands out in an ugly way (in my view) then stands out in summer when it goes dormant and turns brown. If it’s Poa annua, I agree with golfer and hit it with tenacity or another preemergent in early September to try to thwart the next patch (it germinates early fall around here).