Plain English Meaning
A stall that happens when you are pushing the rudder one way and the ailerons the other way at the same time, usually while pulling back on the controls. The airplane stalls suddenly and rolls sharply, often without much warning.
Full Definition
A stall that occurs when the airplane is flown with the controls crossed — typically with rudder applied in one direction and aileron applied in the opposite direction — while the wing exceeds its critical angle of attack. It most often happens in a skidding turn from base to final, where the pilot uses excessive inside rudder to tighten the turn and opposite aileron to keep the bank from steepening, often combined with back pressure to hold altitude. The result is a sudden, that can the airplane rapidly toward the inside of the turn, frequently with the nose dropping below the .