Used when something pleases you, very much. Basically implying that it rocked your boxers (Underwear). Which technically doesn't make much sense, but hey, now a days, not much does.

733t-speak meaning "Rocks my boxers!" but sounds much cooler.

Also: "r0x0r j00r b0x0rz" referring to the "rocking" of an individual's "boxers".

Note: b0x0r can also refer to a computer, a "box"

Actually b0x0rz refers to a computer, not boxers, boxen