Context: Something Gina came up with off the top of her head.
(written by Gina)
Mocking Jay
Jamie, as a young kid, was given the nickname "Jay" by his mother. It was short-lived, as he constantly protested against it as he grew and entered his teenage years, but Stuart would constantly use it to annoy him. After a visit to Stuart's, in which Stu accidently called him "Jay-Jay" in a playful argument, Cathy started calling him that whenever she teased him.