'Jang' is a noun meaning 'testicle' that has many uses and derivatives. When used in the plural ('jangs'), it refers to the balls as a whole, thus including the scrotum.
Its most diverse and most used derivative is it's verb form, 'jangle'. Strictly defined, this means to strike a male in the balls but 'jangle' has seen other uses resultant of its noun form, 'jangler' (see below). Thus, when used with a direct object (generally a name), 'jangle' means to strike said direct object in the balls. However, when used intransitively, it means to act like a jangler (definition two).
'Jangler' is the gerund noun form of 'jangle'. It has two meanings: first, it is more strictly defined as one who strikes males in the balls. Less strictly, however, it can also be used as a label for one who is equally distasteful as a nut-puncher, generally one who is arrogant, deceptive, or foolish.
A verb. To jang. Can be used in place of many verbs. Most commonly describes idle time spent doing nothing in particular, but really works for just about anything.
Racist: "I hate those Jangs I hope they don't come to the main island, all they do is export their fucking box eyed. And their coal, it's a really useful source of coal."