Diddly squat - Diddly means a very small amount of something which is almost negligible when it comes to valuing. This idiom simply gives the meaning that to be something which is very little or to know almost nothing about something.
1. I am diddly squat when it comes to money handlers.
2. This arena is diddly squat in front of that stadium.
3. I don't mind this diddly squat pump gas kit car racing with my hotshot Ferrari.