Those little bits of weed that get in your mouth either from a joint, or a non-filtered pipe. Often accompanied with a bad aftertaste, and is rarely helpful when you get the pasties.
Origin of this word is dirived from the phrase 'jailbait.'
Jailbait became JB, which later became became 'jib' or 'jibber.' It is used to discribe an person that is under the age of 18.
The bestpart of my day is getting a rager from staring at all those jibbers :D