Jag is a Term, mostly found in Scotland as a Slang word for an Medical Injection.
However, They are not called a Jag once used, the name will return back to Needle, a Jag is actually when it is about to or within the Flesh of a person.
somebody younger than you that you can go to for advice, trust, or just company. Age doesn't define wisdom. Age is only a restriction if you let it be and a jag is someone who is willing to always help people.