Never mind the colloquial ... just plain old pronunciation can do you in. "Did you eat" can become "jeweet" or even worse plain "jeet?".
In Hawaii you are likely to be asked "Howzit?"
In Northern New England there's an "insider" greeting :
"Do you think they'll have it?" The imagination displayed by the answer is critical! My favorite is : "Don't know but they just went down the road with the rope." Leaves room for even more speculation. wow.