plastic cash - Any type of "plastic currency" - debit cards, credit cards, gift cards, all that type of stuff that is endowed with monetary value for specific or general use somewhere.
Person 1: Well, this blows ironic. I got like, $50 on my Best Buy plasticash.
Person 2: ...and the problem is?
Perosn 1: I only have $1.47 IRL for lunch!