A commonly-used term in the Drum Corps and Marching Band communities used to describe things as very very good.
Derived from the judging sheets of marching competitions in which the fifth box is the highest score for a specific section.
"That sandwich was box five, bro!"
"The band got a perfect score, because every single point was in box five"
"Your girlfriend was box five last night, if you know what i'm saying"
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