(Must be sitting down in order for it to work properly)
After a hard days work or just the usual male doings, when the chode is humid and sweaty, he scoots to the edge of the chair or wherever he's sitting and finds a comfortable position. He then must spread his legs and move them inward and outward (moving knees towards each other), creating a breeze with his thighs. In turn, the air makes the swampy conditions of his grundle cool in temperature.
"My gooch is so sweaty right now...I need to do the swamp-cooler."