Top Definition
That's G, is basically like saying "Thats cool" or "That's awesome". People who use his phrase too much can get pretty annoying, but those who only drop it once and a while and at the right time, are pretty awesome. Some people drop the "that's" and just say "G", kinda like saying "word", but better!
"Hey, guess what i just won $500 dollars!"
"Dude, that's G!"

"Me and Natalie are going out tomorrow night! man is she hot!"
"G!"
by Aliegurl March 05, 2010

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