Catching a footbag by crouching down as the hack heads toward your er mid-section. Very easy to get out of by simply standing up and outing the bag with your foot. One of my favorite combos is to come in on the foot, go foot stall to neck stall to crouch stall, and then go out off the foot.
I've heard a crouch stall refered to as a "crotch stall" occasionally.