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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!"
by lefthandedpanda January 30, 2010
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The meaning of being Awesome, and being on Twitter at the same time. You're sharing your awesomeness with the world of Twitter, thus making you Twasome. Just by updating, you are thus, twasome, if you're awesome, AND ONLY, if you're awesome.
"I just updated my status, it was totally twasome"

"being twasome"
by Reef Surfer (B.AM.Z.) July 21, 2009
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