Da "lazy man's way" of pronouncing two or more words in a common phrase --- the individual words get corruptedly/messily "run together", rather than being spoken clearly and "separately", the way a "proper" person would say them.
Classic examples of a phonetic shortcut would be "wanna" (want to), "ustuh" (used to), "shouldah" (should have), and "didja" (did you). Disgusting how da young people talk these days!
by QuacksO November 10, 2018