Professor Woo.
The Big Bang Theory Season 6, Episode 20
Woo!
The Big Bang Theory Season 7, Episode 6
Oh, not you, Dr. Woo.
You're fine.
The Big Bang Theory Season 7, Episode 6
the pitching of WOO.
The Big Bang Theory Season 11, Episode 11
Kripke, Professor Woo, Professor Klein,
The Big Bang Theory Season 10, Episode 16