Running in shorts with no underwear, which makes the dong bounce up and down like a slinky hence the name slinky dick
Hey Bry, look at that guy running you can see his slinky dick.
by Jover October 26, 2007
The act of your penis retracting into your stomach, as a result of the force of nature along causing the penis to shrivel up into a small penis that resembles that of a slinky
Sitting on the toilet this morning, I went to take a shit and then I realized I had a slinky dick
by DaCandy Shop February 02, 2011