tbitw is an acronym for "The Bird is The Word" which is a song called "Surfin Bird" by The Trashman.
"tbitw"
"What?"
"Have you heard?"
"Heard what?"
"Oh man, you haven't heard?!?"
"Heard what?"
"Oh man I can't believe you haven't heard!"
"Heard WHAT?"
"That the B-b-b-bird, bird, bird, b-bird's the word...."
by DreamPCs November 01, 2008

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