Green’s Dictionary of Slang

five-by-five adj.

[five x five = square adj. (1)]

(US) good, in order.

D. Burley N.Y. Amsterdam Star-News 22 May 11: I want my banter to really canter, she must be Five by Five.
[US]S. King Dreamcatcher 80: Don’t worry, Pete – everything’s five-by-five.