" Some contend that it sprang up because belts were not allowed in prison - to prevent self-harm, while some believe blacks who were enslaved were denied belts for fear they would aid in escape.
The saggin started in the prison where inmates couldnt wear belts, but in jail culture things started to transcend, said community activist Leonard Jahad, the states top New Haven probation supervisor,
The left pant leg rolled up meant youre in a certain gang and both pant legs rolled up meant something else, Jahad said. When pants are down like the kids wear on the streets, in prison, it means you are available to the next man for sexual activity.
http://www.washingtontimes.com/news/2014/jul/13/for-some-sagging-pants-carry-greater-meaning/
This cultural fascination with the ugliness in society, rather than the good, is incredibly destructive. Instead of role models like MLK, Ben Carson, Condi Rice, etc., the cultural icons are those who don't promote education, achievement, self-respect, respect of others and of life, etc.