when a woman sends a picture of her cooter to another woman on her cellphone, email, etc. warning her to back off her man, because she found the other womans cooter on his cellphone to begin with.
Kim was cootered by Tonya, when Tonya found Kim's cooter on her man Gregscellphone.
To be "cooked in the head." Probably comes from "fried" or "brain fried." Imagine how someone would act if their brain was at least partially cooked. Could mean under the influence of drugs/alcohol or someone acting crazy or out of the ordinary.