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1.
An Exclamation. Used in the same manner as the word "phat" but with an extra "ness" to the end. It can also be used in place of an exclamation point but in an seperate sentence. Phatness and an exclamation point combined yield amazing results.
"Hey man, we're so stoned"
"Phatness!"
by Shiran "Filibuster" Weber April 17, 2003