the act of being a jibb, to be of below normal standards and having an IQ about the same as Forest Gump. The subject referred as a jibberman usually has poor bowel and bladder control, Noticeable in obvious staining below the waist on their clothes.
when your parents are really annoying and don't use heat in the winter, and instead force you to wear sweatshirts and shoes in your house, and tell you to use extra covers to stay warm at night.