Jimmy is a fun loving wild and crazy guy. One you want in your foxhole. He can fix anything as in “jimmy rig it.” Even the bad times with him are good.
Jimmy is an adjective used to describe someone negatively, it is the most negative thing to call someone anytime, anyplace. Basicallythe strongest insult known to man(or woman)kind.
Johnny: So Toby are you having fun reading that book?
Toby: I don't know i can't comprehend the book.
Johnny: Your such a Jimmy.
(Toby walks away in tears)
Johnny: There goes that Jimmy.