To sit or stand with one's legs apart, opening the crevice between genitals and inner thy in order to allow air circulation and avoid sweating. Can also be used as a phrase like "Slow your roll," i.e. "Cool your Groove."
See Arthur Kingsley stooping over there? Chances are hes Cooling his Groove.
All men took 1 large step to the left, creating a large gap between their feet; Maximum Groove Cooling was achieved that day.