(a) Scottish parochial for a street weapon. The weapon may be a regular weapon, like a machette or a knife, but is often an improvised weapon like a club with a blade embedded in it, or a hammer.
(b) Scottish parochial verb for injuring someone with a hand-weapon of some kind.
(a) How dae ye like ma chib, big man, no bad, eh?
(b) See you, ya tool, ah'm gonny chib you, ya radge.