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1.
A phrase used casually to describe when someone or something disappears without explanation or justification, especially mid-conversation.

Derived from the disappearance of Kara Thrace (Starbuck) while in mid-conversation with Lee Adama (Apollo) on the series finale of Battlestar Galactica
"Hey Dad, can you pay for my... Oh, I think he just pulled a Thrace."

"Oops, my signal died, didn't mean to pull a Thrace..."
by Sue Dunham March 20, 2009