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(adj.) It's a synonym for wonderful or awesome except, if words wore clothes, then Trounciful's clothes would be WAY more expensiver than Wonderful's or Awesome's. That basically means trounciful is a word that communicates slightly MORE than just "wonderful" or "awesome".
"Bear is my favorite person because he's trounciful."

"This outfit is so trounciful."

"Wow, that movie was way NOT trounciful."
by chasyaldora July 22, 2008