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To plug in and take over a system, like a boss. You’re not just logging in, you’re ruling the place.
My brother jack-in’d to the school network and changed the principal’s password to ‘password’.
I jack-in’d to my crush’s account and posted a goofy photo of him eating pizza.
My mom jack-in’d to my gaming console and turned my 10-hour session into a 2-minute speedrun.