That place where you and your friends all meet to smoke up, sometimes on foot but predominantly in a vehicle. When one refers to the Coldasac in conversation there are no questions asked, everyone knows where "the Coldasac" is.
A surgically created man-gina for a tranny; When a man "culls" his sac and adds a fake route for lost drivers. You can have a lot of fun testing out your ride in the culdesac, but it goes nowhere.
My boss had no fears of leaving his spawn in Thailand, all the he/she hookers sported culdesacs.