Champagne Dream

Noun. A grandiose desire to obtain some or all first-class indulgences that are completely out of reach due to financial burden or strain, causing either maxed-out credit lines and / or leeching on to someone who is well-funded.

Ex.

Chris: "Wow. He's giving Casanova a run for his money the way he seduces these trust fund women."

Bailey: "Yeah, but his champagne dream will dry up when they leave him down and out."