terminally online
dismissive, extreme
the one-line answer
So deeply absorbed in internet culture that normal offline life is incomprehensible.
Terminally online is a step beyond chronically online. This person exists almost entirely in internet spaces. Real world interactions are confusing to them. They cannot turn it off.
mainstream
Your coworker might use this word.
01 / in the wild
hear it move.
roast
she got mad that people didn't know the meme she was referencing. terminally online.
She expected real world people to have the same internet references she does.