A female whose physical features (ie. bottom, hips, thighs, breasts, etc) or demeanor (bratty, rude, bitchy, slutty, etc) incites the urge to take her over your knee, under your arm, bend her over, or position her otherwise, and spank her long and hard.
1. Did you see her ass? That broad is totally spankable.
2. Damn, that bitch needs an attitude adjustment. Extremely spankable.
ass hot spankable means some girl is so fine you just want to hit that all night long. Meaning she looks very very very very very very very very fuckable.