Etymology

• brain fag (1) possibly originates from West Africa^[1]
• brain fag (2) colloquial term for cerebropathy^[2]

Noun

1. A condition to which male high school and college students are prone consisting of difficulty in concentrating, mild forgetfulness, and difficulty in maintaining a train of thought, arising from "too much thinking". Physical symptoms can manifest as well.
2. see cerebropathy