I get's retarded, the yellow bus I'm a park it
In front of your house, hop out, gun in ya mouth (Blakka!)

Meaning

Kendrick will do some dumb shit and end up in a special needs bus the small ones:

Park it in front of your house, and blast you.

To help improve the meaning of these lyrics, visit "Evil" by Schoolboy Q (Ft. Kendrick Lamar) Lyrics and leave a comment on the lyrics box