Professor Woo.
The Big Bang Theory Season 6, Episode 20
Oh, not you, Dr. Woo.
You're fine.
The Big Bang Theory Season 7, Episode 6
...that neither of you
would attempt to WOO her.
The Big Bang Theory Season 4, Episode 6
Woo!
The Big Bang Theory Season 7, Episode 6
Your inability
to successfully WOO Penny...
The Big Bang Theory Season 1, Episode 14