It is when you take your dick tuck it inside of your self when it's limp and push your legs together to hold it inside. Then start walking and open your legs so it goes SPROING!!! (Usually done by little children)
I was bored one day so I tucked in my penis and watched it go sproinger.
Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.