What is meant by "chill seizure"?

Febrile seizures. These are common in children less than 5 when fever spike all of a sudden--most have no residual, normal developmentally--a small group of children presenting with atypical features like long duration, unilateral, have post ictal paralysis, strong family history continue to have seizures then it is epilepsy.
No idea but ... I would guess that the term is being used to describe the physiologic reaction during the seizure. Some patients get chills or flushing or palpitations or other autonomic reactions associated with the seizure event. Gelastic seizures occur with laughter and even sexual arousal from a hypothalamic focus. Ask your neurologist for the reason for the term.