When you're taking a situation as it comes and flying by the seat of your pants. Often attributed to anxiety, and feelings either good or bad. A reference to clinging fiercely to something, such as a rope, to the point where ones knuckles would turn white from forcing blood from the capillaries.
Barbaric way to impregnate a woman. The correct method would involve firstly restraining a woman. Next a male will proceed to orgasm onto his fist where he will punch the female in the vagina. Repeat with fresh cum every 2-3 hits to insure efficiency on this most delicate of procedures.