(That wasn't no sample nigga!)

from A$AP Rocky (Ft. Action Bronson, Big KRIT, Danny Brown, Joey BADA$$, Kendrick Lamar & Yelawolf) – 1 Train Lyrics on Rap Genius

Meaning

KRIT is one of the only rappers who have collaborate with the legendary blues artist that is BB King. Not many rappers will get the opportunity either. He clarifies that the vocals and guitar were live recordings and not taken from anywhere else, implying that King only collaborates with those who he vibes with and thinks are truly great people.

Footage of the studio session:
http://www.youtube.com/watch?feature=player_detailpage&v=meRunIb97hw#t=326s

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