Bitches be giving me brain, my dick be deep in they heads like psychology

from Slaughterhouse (Ft. K-Young) – Lyrical Murderers Lyrics on Rap Genius

Meaning

“Brain” is slang for a blowjob. He is saying that his dick is so far into their mouths, or in this sentence their heads, that it is metaphorically as deep into their head as psychology is, which is figuratively deep in a person’s head.

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