hi-res, adj. — Green’s Dictionary of Slang

hi-res adj.

also hi-rez

[abbr. SE high resolution, used to define image quality on a video monitor]

(US) fine, satisfactory, admirable.

1938–85		McCrum, Cran & MacNeil Story of Eng. 37: She’s high res. (She’s on the ball).
1986		Eble Campus Sl. Nov. 5: Hi rez...feeling good: ‘I’m ready for that test. Strictly Hi rez today.’.