Card Pooling

Adding your name to a card, with or without the knowledge of the person who bought the card, to avoid having to purchase a card of your own.

Joe: Hey man, did you get Stacey a birthday card?

Jim: Fuck, I forgot. Looks like we'll be card pooling again.

Joe: You're a dick. You've signed every card I bought except the one for my parents anniversary.

Jim: I signed that, too.