Also known as Balderdash or Fictionary
After people have learned many of the phrases, play this game to reinforce vocabulary, or when you introduce a new word or phrase.
Assign a three-person group one of the signs or posters, and have each person say the slang phrase and a possible meaning/definition (they can coordinate ahead of time and/or you can pre-assign who says what). Only one is correct: all of the other participants vote on which is the right answer. Regardless of the vote, ensure you reveal the correct answer at the end.