A word game developed by the hosts of Six Billion Voices, a wildly popular podcast available on iTunes. The game is played by giving a word from urbandictionary.com and having the rest of the cast guess the definition.
Eric: Matt, let's play Guess That Word Biatch!
Matt: The word is "pizza tumor"
Eric: hmm
Dover: umm
Brady: That little bubble of crust of the edge of a pizza.
Matt: That's correct!
Brady: You can give me all the pizza words, I'm not missing any of those.
Another rendition of "that's my word" meaning "I'm serious" or "that's the truth" or even "that's a fact". Essentially, you're trying to get across that you really mean what it is you've just said.
Dude#1: Yo, I had a menage last night with those two girls from the club!!!
When someone is using foul language, or tells a dirty joke at a dinner party, the host may politely yet firmly request he "stop that word". If that same someone continues with his rude antics, the host may stop the guest and remove him from his home.