1.One who is not in possesion of full mental faculties, usu. due to self created environmental factors, such as bad diet, poor hygene, drug abuse, alchoholism, from being an extremely lazy thinker or an otherwise slacker.
2.A lazy, stupid, ineffectual, naive, complaining and demanding individual.
1 While on her show, Anna Nicole Smith was an unapologetic half-chad.
2 The unemployed 41 year old mama's boy, making a scene at the pizzaria over the price of the buffet was being a total half-chad.
3 My half-chad little sister can't do a single pushup.