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Bo Knows 

1. To know everything except what is really important.
2. Coined by Bo Jackson, who "knew" everything except how to stay healthy.
1. "You lost the game!"
"But I rushed for over 400 yards..."
"You lost the game!"
"Bo Knows how to run the ball."

2. Bo Knows how to play two sports...
Bo Knows by jDogg March 1, 2005

Bo, you don't know diddley!  

This is a catch phrase that originated in a TV ad in the late Eighties that featured super athlete extraordinaire Bo Jackson and rock'n'roll pioneer Bo Diddley (he's notorious for his famous box-shaped electric guitar). Basically, the term means that somebody doesn't know doodly squat.
The narrator says:
Bo knows football.
Bo knows baseball.
Bo knows weightlifting.
***********************
In the meantime, Bo Diddley cranks out the notes on his guitar.
Then he says:
Bo, you don't know diddley!