Definition & Meaning of "get brain"in English

What is the origin of the term "get brain" and how is it used?

"Get brain" is a slang phrase for receiving oral sex that appeared in late 20th- or early 21st-century English, particularly in American hip-hop and youth culture. "Brain" is used metaphorically for the head, referencing oral stimulation, and "get" signals receiving the act. The phrase is used in informal, sexual, or joking contexts, often in music, online, or peer-group conversation. It is vulgar and sexual, never neutral, and inappropriate in polite or formal settings.