The act of giving a hand job with furious wrist action

Style with Ease

Possessing the qualities of a wrist.

Also see: Giulia Giordano

Another bleak play on words for a hand job from a male or female.

What's known in Yank-land (America) as a "hand-job."
Basically, a woman manually stimulating a man.

when a female masturbates a penis

All the other definitions of wristy are wrong. The wristy is actually sort of a "high-five" alternative where one bends his/her wrist about 45 degrees, also making a very slight fist, and makes contact at the wrist of another person doing the same thing. Used to celebrate the mention of the number five, a shared amusement, or a mere agreement.