A mix of the words "dude" and "totally" in one word.
-Yo dude, did you hear about that concert next week? It's gonna be pretty fly. Wanna go?
-Dudely. I wouldn't miss it for the world.
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It's the G (for ghetto or gangster) version of saying the phrase "What the fuck"
Bristol Palin is on Dancing With the Stars?! Whaddafuh?!