Unabbreviated meaning of the acronym "gp".
"General Principle" is a general concept of street fairness and/or street rules governing everyday conduct. Thugs, pimps, dealers, inmates, etc. have an inherent General Principle instict derived from street life experience, pride, and respect for the game. GP cannot be taught, it can only be learned instinctively.
Those that possess General Principle cannot allow themselves to "go out like a punk".
That mutha-fuka was mean muggin you in front of all them fools! Shit, you can't go out like a punk! Now you HAVE to go fuck him up on General principle!
That bitch tried to jack my shit. I got it back, but I still knocked him out on general principle.