dragon sack is derived from the word rodney made up used to describe phillipe wilsons bed, which has pictures of chinese dragons on it. rodney called it the dragonsack. we all slept in the dragon sack together back in the day. now i call my ballsack the dragonsack, and i am known for inventing it. it is used by youth in regions in almere and amsterdam.
dragon sack can also be used as a verb. for eg.
meaning someone pulled out their nutsack and showed it to them
black guy: hey check out my dope new phone
hawaiian guy: *looks down*
black guy: that nigga just got dragonsacked!!
or kaspar has a big dragonsack with smooth ballskin