30's, 40's phrase used on an uptempo dance tune, as a command to the rhythm section (the drummer is "daddy" as in "daddy-o") to emphasize 8 beats to every bar of music, giving it a feel of doubletime (as opposed to 4 to a bar)
a command used by the singer to go to doubletime, such as after a chorus, to shout "beat me, daddy, eight to the bar!"
something that is five to eight is something that is slim, literally (a tie-where it originated), figuratively (chances, the likelihood, etc.), generally unlikely or only slightly likely. created on a fine april day via a misunderstanding in math class regarding fat mays' tie, which is the epitome of five to eight. the term derives from the time 7:55, or five to eight, when the chances of getting to 8 o'clock class in time are very slim/uncertain.
1-dude that tie is five to eight as hell!
2-yeah, its only like an inch wide!
or
1-what are the chances of us getting caught?
2-pretty five to eight, shots is on duty tonight