It's your index fingers on both hands used simultaneously to spread apart a woman's labia to eat her out.
My snooch paddles are cramping up from eat your moms pussy last night.
A method in GTAW welding when you have no gap and you need a full penetration weld and you move your rig hand's elbow back and fourth like your swatting Mosquitos
That root gap was so tight on that fit I had to do some skeeter beatin on over half the weld.