Literally: "too rambley; didn't listen". This spoken phrase is a take off of the popular "tl;dr" (too long; didn't read). Pronounce the letters, namely "tee are. dee ell". This verbal response indicates you stopped listening as the other person was blathering on for too long and you lost interest.
Sarah: So what do you want to do for dinner tonight? We can do Mexican, Italian or Chinese. I want to invite Steve and Kathy, but of course you know that Steve does not like Chinese and Kathy can't eat late. But the only good Italian place is really crowded so the wait would be really long early.. which I guess leaves either that burrito place.... or that not so good Italian place, where the waiter was rude to us the last time. So, what do you think?