Insult; meaning you are inpatient, jump to conclusions, can't follow directions. Term originated from the south referring to "cooks" who can't wait long enough to cook their corn bread (johnny cake, journey cake) so that it's wet in the middle.
Todd's cornbread is wet. He can't be counted on to finish his unit testing before checking his code in.
Boy WTF, your cornbread is wet, check the f**k'n shell before you load the shot gun, 12 gauge don't go into a 20 guage.
Pelosi's cornbread is wet, she can't wait three day's for others to read the freak'n health care bill online before voting on it This so constituents can comment to their representatives about it.