Coined by Michael Ian Black in his book "My Custom Van". It is a shorthand word he invented for "it was awesome."
From the chapter "This Is How I Party":
"I twirled it around like a baton and let the majorettes fight over it. Which they did. ALL. NIGHT. LONG. T'wasome!"
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Contraction of "It was awesome", coined by Michael Ian Black.
I just got back from Bangkok. T'wasome!