Shorts that only go down to your knee (maybe shorter).
Back in the day, people wouldn't have their shorts down to their ankles like people do now.
Haven't you seen old school ballers from the NBA? Their shorts would be at their knee caps or shorter.
About the example: When Nas first got into the rap game, with the album 'Illmatic' back in 1994, people weren't wearing these huge over-sized shorts that some people do now.
When Nas hit the scene I was still rockin knee-highs - The Game on 200 Bars and Runnin