In Scotland this is pronounced "If ye never Had a Shuck Ye'd Droon" but to the rest of the English speaking world would be pronounced as "If You Never Had a Shuck You Would Drown!" This means that if you didn't have an Arse Crack you would drown in your own Sweat. This emplies that the Arse Crack is some sort of Drainage system for sweat to seep away and without it there would be a build up of sweat which would eventually drown the Sufferer.
by Magnesium Sulphate March 23, 2006