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To be ruined or vandalized, specifically referring to technology. Originating from computer nerd/hacker culture, the phrase literally describes a box (computer) that has been rocked.
I box rocked my precious ~/ partition when I attempted an in place upgrade from ext4 to btrfs.

John got shit-canned after his company's server got box rocked by some script kiddie.
by NEETphreak March 29, 2013
when a chick gets punted in the vaginal region
Holy shit man, did you see that girl get box rocked in that catfight?
by dozer333 December 03, 2007