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!!!
Dude#2: Say word?
Dude#1: That's word!!!
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