An expression used in a fit of anger when you feel exasperated, having no control of a situation or the people around you. Niggers are worthless so cussing them is an easy way to bow off steam. Just say "Kill all Niggers" to let it all out. You don't have to kill anyone. It's a joke. (at the expense of niggers).
Most used in graffiti in the Maryland area by 2 above average dick sized men. Meaning don’t focus on “killing” or the bad now focus on it when the time comes or “then.” Could also be abbreviated at KT.