the thing that you don’t have when you’re phones percentage is over 20

D4c is short for dirty deeds done dirt cheap and it is a stand name from the anime series jojo's bizarre adventures

A stand in JoJo's Bizarre Adventure:Steel Ball Run(part 7).Stand of main antagonist Funny Valentine.Can hop through multiple dimensions(or ''worlds'') between objects.
It does not stand for

D.Filthy
D.Acts
D.A
D.Reasonable
C.Price
If you thought it stands for this,you need to spend 5 years in a tank of holy water.