the original definition of this word, brought forth by Mr. North back in 1988.
A non-specific insult used as an inside joke among friends to describe anyone that happens top be in your crosshairs at that moment in time.
Mr. North: "Shut the fuck up, Jerome, you're nothing but a spack."...Jerome: "What's a spack?"...Bystander hip to the joke: Trust me man, you don't wanna know."