Definitions by Tuomas

Jack-rack 

1) Hanging upside-down whilst cracking one off; [2) Someone engaged in 1).

From the sink-holes of Surrey in England.

1) My back was killin', but I fancied a quick spaff, so I did the Jack-rack.

2) Dude, you're such a Jack-rack.

Jack-rack by Tuomas February 21, 2006