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1.
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!"
by msellberg April 14, 2005
 
2.
Exclamtion form the excitement of something accomplished, usually from atheletes
Team members from a football club, after winning a game, would give a high 5 and say "Beat me daddy eight to the bar."
by jan TAYLOR March 06, 2005