Backsplat: to splat on your back. Very important in cat kinetic dynamics. Especially since falling with their back down is the most stable position aerodynamics wise
Female cats perhaps, but with male cats drag would press the cat's tails against its balls and it doesn't like it
So instead cats spread out their legs to offer more resistence to air to further slow down, a bit like a squirrel does. Female cats have copied that out of racial loyalty.
Backsplat is verboten!