Nick Young is begging his friend and neighbor Chris Brown ... PACK YOUR STUFF AND MOVE ALREADY ... 'cause you're ruining the neighborhood.
Young currently lives right near Brown's valley home in Tarzana, CA -- which was surrounded by the SWAT team and police helicopters Tuesday morning after Brown allegedly threatened a woman with a gun.
"Chris Brown, you gotta move," Young says with choppers still flying overhead ... "Go on, get away from here!"
Young says Brown is essentially "making the block hot" -- attracting way too much police attention and he's worried the trouble is going to spill over his way.
"There's really only two of us [black people] over here ... at this rate you gonna make it one."
"Please, I like you, man. You my dawg. We go out, but you go out away from over here ... go!"