She doesn't have very feminine hands. "Man Hands", as Seinfeld would say...
JERRY: She had man-hands.
ELAINE: Man, Hands?
JERRY: The hands of a man. It's like a creature out of Greek Mythology, I mean, she was like part woman, part horrible beast.
ELAINE: {Look,} would you, prefer it, if she had, no hands at all?
JERRY: Would she have hooks?
ELAINE: Do uh, do hooks make it more attractive, Jerry?
JERRY: Kinda cool lookin'..