The term Jaypea began with the egyptian word for "eyebrow", although in later years the native americans adapted this for their own use; 'crazy eyes', the tradition being that if an individual happened to gain alapecia of the eyebrow they would become known by tribesmen as simply, 'Jaypea'.
Over time the phrase has evolved into 'wannabe' and fishermen began to use it as a noun for sharks.
The modern day term for 'jaypea' however is usually considered to mean ginger.
when a person is described as doing a 'jaypea' it usually means they have an innate tendancy to get angry and hang up the phone.
"shit you've got a jaypea on your brow'