Wiktionary
sonny jim
n. A familiar term of address for a boy; sonny, laddie.
Usage examples of "sonny jim".
General Zulfikar became the latest in the line of men who have been willing to call me 'sonny', or 'sonny Jim', or even simply 'my son'.
As Harry approached, one of them croaked, 'You should be in class, Sonny Jim.
Terribly sorry, your highness, but Sonny Jim has flitted off to La-la Land.