1 definition by Manuel DeDoof
The occurrence of one's testicle slipping out of their undergarment thus being exposed below the leg opening in their shorts.
"Dude, I was at the gym talking to this hot chick when I felt a cold spot in my crotch. I looked down and one of my balls was hanging out of my shorts!"
"Then I looked up and she had already spied the sackslide!!!"
"Then I looked up and she had already spied the sackslide!!!"
by Manuel DeDoof December 10, 2009