scorpion thumbs
The raised, angular position that the thumbs assume as they engage in texting, striking alternately left and right.

An added further feature may be the (scorpion) claw, an extended index finger that wraps around a Red Bull or other beverage while texting or otherwise interacting with a handheld electronic device.
On hearing the incoming text alert, her scorpion thumbs snapped into position, ready to strike.