Did you have to WOO me?
The Big Bang Theory Season 4, Episode 9
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
Kripke, Professor Woo, Professor Klein,
The Big Bang Theory Season 10, Episode 16
Professor Woo.
The Big Bang Theory Season 6, Episode 20