When a computer-savvy individual is not as skilled in one or more aspects of hacking, programming, or a certain operating system as they are otherwise expected to be.
"Dude, my MacBook is acting weird. Can you take a look at it?"
"Sorry, man. I don't do so well with Macs. It's a technallergy of mine."
"What? Do you break out in a rash or something?"
"Your mom breaks out in a rash."