I don't care about that diddly.

I tried to imitate the sound of a bird, but all I could produce was diddly.

I don't know diddly about cars.

I found a box full of diddlies in the attic.

I searched everywhere, but I found diddly-squat.

I searched everywhere, but I found diddly squat.

He played the diddly bow at the street corner.

I saw a group of diddly bows at the music festival.

The cake was scrum-diddly-umptious!

I don't know diddlysquat about cars.