1.)Term used to discribe someone who is doing douche things and being an instigator or when someone tries to push you over the edge or try to make you aggravated enough to fight them
2.)When a person has to take a shit so bad they are on the verge of crapping their pants.
1) "so that little shit-brink jaykwon was tryin to fuck with my shit yesterday"
"you beat dat niggas ass?"
"hell yeah, i stomped the fuck out dat pussy ass nig"
2) "I was on a shit-brink during that whole test.
I swear if the bell didnt ring soon i was about do drop a douce on the teach's desk