To request divine intervention in a potentially-dangeroussituation, instead of relying on aerosol-based capsicum-fluid.
Since it's ridiculously easy to get charged with assault by someone whom you "mace the face" of (for example, the person can always deny that he had intended you any harm, even if you know that he very likely was planning to hurt you), it's a wise idea to just choose spepper pray in all but the most extreme of circumstances.
One who constantly steps over "the line" whatever that line may be. This has the effect of forcing you as an observer to set him or her straight with physical force or the threat of physical force.
(from Chappelle's Show: Charlie Murphy True Hollywood Story)
RICK JAMES "Charlie Murphy!!! (punch to the head, leaving a mark)
Then Charlie Murphy proceeds to kick Rick James' ass because he's gotta check that shit so it don't happen again, forcing him to stop being a habitual line stepper.
A stepper is a person known to carry guns and is always ready to fight, typically known to not fear jail time. Usually quiet people not known to start anything but will not hesitate to engage in any kind of fighting.