An exclamation of surprise, shock, frustration, anger, or annoyance. A euphemistic variant of "God almighty." Gosh almighty! If we'd stopped the car one second later that train would have hit us! I know you've had a long day at work, but gosh almighty, is it too much to ask for you to take out the trash? Gosh almighty, it's hot as the dickens out here!
See also: gosh