Homo- Same
Somato- Body
Typing the name of the body part corresponding to the one you are typing it with. I.E. typing "nose" with your nose.
Tim: Nose
Haha I typed "nose" with my nose!
Jake: Heart
Tim: Jake...?
Jake: ...
Tim: Jake, WhAt ThE fUcK?!
Tim: ...
Jake: HOMOSOMATIC TYPING...
Tim: AHHH SHIT, WHAT THE FU-