What is "chemically imbalanced"

a. 1 (&lit chemically imbalanced English) 2 (context euphemistic English) mentally ill.

Chemically Imbalanced is the fifth studio album by Atlanta-based rap duo Ying Yang Twins, released on November 28, 2006. The first single is " Dangerous" featuring Wyclef Jean and production by Mr. Collipark. This album was originally titled " 2 Live Crew", an ode to the hip-hop group of the same name. This album debuted #40 on the Billboard 200 with 36,000 copies sold, a far cry from the sales of their previous album, U.S.A. (United State of Atlanta), which debuted at #2 in the summer of 2005. It now has sold only 120,717 copies in USA, according to Okayplayer.com Boards.

Chemically Imbalanced is the debut studio album of American rapper Chris Webby. The album was released in stores and on iTunes October 27, 2014. The album featured appearances from Dizzy Wright, Jarren Benton, Tech N9ne, and others.