1. To descend to the level of one considered inferior; lower oneself.
2. Thinkin' your shit don't smell
3. To deal with people in a patronizingly superior manner.
Those who thought they were honoring me by condescending to address a few words to me. --F. W. Robinson.
Law School professor who talks to students like they are first graders.
The condescending Pat Bob said: "Mr. Whitten, will you tell me when I can continue talking."