by THEBIGSHOW May 20, 2013

by Mr. AAAAAAA December 01, 2019

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!
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!
by I Saw U2 Live Twice October 02, 2007

by colbyco July 12, 2009

A random assortment of items; often food or edible items, of which the person doesn't necessarily know the name of.
by Maccas75 May 30, 2020

All my coworkers do all day is jack diddley fuck and I always have to clean up after the lazy bastards.
by jimmybomm April 21, 2022

A person or persons with little of anything, a tiny bit if not no amount of coin, papa, goods, moral fiber, character, class, education, stamina, cupboards bare as backside, nothing except fresh air.
Jack the lad, are we checkin' what flicks to watch while we are walking right past the cinema? Nah! you ten point tosser, I told yar, I ain't got beans, diddley squat, zilch to go see a movie unless we sneak in.
by By Paulton P. Puddington Jnr. June 22, 2025
