Yeah, bitch, cut the swag with a fuckin’ knife
from Childish Gambino (Ft. Beldina Malaika) – Not Going Back Lyrics on Rap Genius
Meaning
Want a some of his swag? Well, you better get a sharp knife and cut off a piece because it is meaty.
I’m also confident there is cut/fuck knife/dick word play here.
Possibly another Lil B reference

To help improve the meaning of these lyrics, visit "Not Going Back" by Childish Gambino (Ft. Beldina Malaika) Lyrics and leave a comment on the lyrics box