The sign for "angry" is made by forming "claw" hands and placing your fingertips against your stomach. 

Pull both hands forcefully up and outward. 

Memory hint: "As if being so mad you could rip your guts out."

Sandy:  "Aren't the thumbs extended?"
DrBill:  When I sign ANGRY, I notice I start with the fingers and thumbs of both hands in a "five" handshape.  So, yes the thumbs are extended at the beginning of this sign. Then as I pull the sign up and slightly away from the body my fingers and thumbs flex more.  The fingers bend at the second and third knuckles but not at the first knuckle (large knuckles).

VERY IMPORTANT:  Use an angry facial expression.

For more information see:
"Angry/Mad advanced discussion."
Also see: "MAD"