A term used when describing how hot and humid it is (most commonly used in Texas), compares the temperature of a room to the area between Satan's testicles and asshole
Guy 1 "We need to fix the AC unit, it's, like, 100 degrees in here!"
Guy 2 "I know, it's hotter than Satan's gooch in here!"
When the weather is so damn hot, wet and humid, it's hotter than a man's balls. You're sweating so much that your pants stick to your ass and you just feel like shit.