If you use Google to search on types of grass (it might look like "grass weed Dallas Texas
") and then click over to look at the images (your search results page has a column on the left with choices that include Images.) The link I embedded above is that particular search. Scroll through the images and see if you find what it might be.
Have you seen a seed head on this grass? What does that look like? Does it have sticker? Does it flower? Does it have a distinctive smell? Anything along these lines might help others identify it without a photo.