US & UK - Derogatory term used to describe people with olive tanned skin. Used in similar way to terms such as 'Black' and 'White'
US - Used mainly for Black people with light skin pigment, Arabs, North Africans, Pakistanis, Hispanics, Latin Americans (Latinos), Native Americans, Mediterraneans, other Middle Eastern and Indians.
UK - Used mainly for Black people with light skin pigment, Arabs, North Africans, Pakistanis, Indians, Afghans, Mediterraneans and people of other Middle Eastern Descent.
Because of the many countries that litter South Asia and the Middle East, the term 'brown' is used in teenage circles as a blanket term. (One thing in common of people of these origin is their brownish-reddish-tan skin.)
Not a racial slur. (in most cases)
"I'm going to the mall with all my brown friends."