1. The act of balling one's hand up into a tight fist, and placing it into your partner's vagina, either vigorously or delicately. However it is usually rythmic.
2. The sensual act of ever so delicately teasing a woman lovingly, then suddenly
penetrating with your entire fist. Can be quite
effective when combined with suspenseful music. Make sure to wait until
the climax of the song to ram your entire fist in.
3. Commonly referred to as a "hit below the waist" in boxing matches.