
...that neither of you
would attempt to WOO her.
The Big Bang Theory Season 4, 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

Did you have to WOO me?
The Big Bang Theory Season 4, Episode 9

Oh, not you, Dr. Woo.
You're fine.
The Big Bang Theory Season 7, Episode 6