get brain v. to receive fellatio. (source: Double-Tongued Dictionary)
Further reading
Samantha Harvey’s novel Orbital is a sensuous, exhilarating meditation about the strangeness of life on a space station, with its mix of tedious tasks and jaw-dropping views. And: a musician who rode the rails in his youth shares the slang he...
Steve, a singer-songwriter from Rock Springs, Wyoming, shares some slang he picked up while months riding the rails and busking. Spanging refers to panhandling, from asking for “spare change.” The term bull refers to a type of security...
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