Diddly Don't 

A girl that you wouldn't fuck or "do"

"What do you think of that Karlene chick. She's kinda cute." "What? No way man she's a diddly don't."

Diddly Don't by Stephanie Beans December 28, 2007

Don’t Diddle December 

For when you failed no nut November

John: I failed NNN so now I’m doing Don’t Diddle December

Don’t Diddle December by Watson my dear December 2, 2019

Don't Diddle December 

Redemption for people who failed No Nut November. Same rules just for whole December.

Bruv you passed NNN?
No, I'm gonna try again during Don't Diddle December

Don't Diddle December by Jace333 December 1, 2018

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!

Bo, you don't know diddley! by I Saw U2 Live Twice October 2, 2007