It's a party game.
Everyone is dealt 10 white cards.
Each white card has something random on it. More often than not something sexual, racist, or in bad taste.
One player reads a black card. A black card has something like "The best offense is a good ___________"
Every player except the one reading the black card submits a white card.
The cards should be shuffled or otherwise hidden so the person receiving the cards don't know who played what white card.
The player than reads each of the white cards and chooses what he feels is the best answer. The reader can choose the funniest, what makes the most sense, or whatever their criteria is, no wrong answer. The better you know the person the better chance you have, in theory, of picking a card from your collection they like the best.
Whatever player's card is picked as the best, that player gets to keep the black card.
The next person reads a black card and play continues until one player gets 10 black cards.
So it can take some time to play. It's easy, no game board, no paper/pencils needed. Lots of interaction.
Really fun game. A shame it's so adult oriented, certainly a kids safe version would do well in families that still care about such things.
Otherwise grandma is reading a card about guzzling 100 tons of cum.