The politically correct way to say someone is technologically retarded or ileterate. Someone who cannot understand how technology works or how to use it. Can be shortened to T.D.
Melissa: my dad just called me to ask me how to turn his laptop again.
Mike: your dad is technologically disabled !
Melissa: yea, he's so TD!
When a person, typically an elderly person, but sometimes a middle aged person, has trouble using or is unfamiliar with modern technology. Can include technophobes.
My grandma is so technologically disabled she can’t even use the TV.