ambithumbi 

Being equally adept at texting with both thumbs

Larilyn is really good at texting, she's quite ambithumbi

ambithumbi by theophrastus August 18, 2010

ambithumbstrous 

the ability to type text msgs using both thumbs.

Now that she has an iPhone, she's gotten really ambithumbstrous so she really pumps out the txt msgs.

ambithumbstrous by vegasboomer April 24, 2009