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.