
Your inability
to successfully WOO Penny...
The Big Bang Theory Season 1, Episode 14

Professor Woo.
The Big Bang Theory Season 6, Episode 20

Woo!
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