According to the November 19 New Zealand Herald, Cards Against Humanity is a politically incorrect party game in which players complete fill-in-the-blank statements with offensive, risqué or politically incorrect statements (see their website).
In 2018, they launched a Kickstarter campaign which enabled donors to purchase tiny parcels of vacant land on the US-Mexican border for $15 each. More than 150,000 people who bought parcels now collectively own thousands acres of land on which Trump plans to build his wall.
Cards Against Humanity has also hired a prominent eminent domain law firm to protect the new owners’ property rights. Their hope is to make construction of the border wall prohibitively expensive and time consuming.
They explain their campaign in this holiday video:
For more information about the organization and their border wall campaign, go to Cards Against Humanity Stops the Wall