1.VerbTo manipulate or toy with (an object), especially in a nervous, restless or aimless manner.
"Stop fiddling with your food!"
2.VerbTo tinker with: to make small adjustments or improvements to (something), especially in an experimental or unskilled manner.
"If you fiddle with the controls, you might be able to get a better TV picture.; The deadline for my report is two o'clock, but I'm still fiddling with it."
3.VerbTo manipulate in order to gain something for oneself.