Its a name created by a lififa journalist "Javeria Siddique" daughter of Irfan Siddique and w/o a renowned Lifafa "Arshad Sharif".
Origin : Urdu
Pronunciation : Dig'geeee
Meaning : Rear of a car ,Trunk and Boot .
A girl was in a Diggy(Boot,Trunk) with her dog of a car.