get brain v. to receive fellatio. (source: Double-Tongued Dictionary)
Further reading
The word filibuster has a long and colorful history, going back to the days when pirates roamed the high seas. Today it refers to hijacking a piece of legislation. Plus, the language of yoga teachers: When doing a guided meditation, you may hear...
The slang term 4-55 air conditioning is means cooling a car by driving fast with all the windows down. This is part of a complete episode.
Related
Also “skull”
Yes, but “get skull” is too well-known to bother with here.
Homeboy gonna get him some skull tonight?
Also gobbie/gobby.
he gonna git some brain, in otha words homie gonna git sum head haha