The act of flushing the toilet to muffle out the sound of you fucking your friend's wife in the bathroom of the hotel room you and your wife are sharing with him and his wife, usually occurs after a long night of drinking. Sometimes requires multiple flushes. Often combined with one of the many forms of blumpkin.
I invented the camoflush last weekend whilst banging my buddie's wife in the bathroom at the holiday inn express, while he and my wife were both asleep in the other room. So basically I saved some duckets on the hotel room and also scored some strange.