If you're talking about the episode 'We Love You, Conrad' (UK Season 8/US Season 7), in which the following conversation takes place -
Stewie: So, did you break up with Lauren?
Brian: No, I didn't. As a matter of fact, she's coming over for dinner tonight.
Stewie: Say whaaaaaaaaaaaaaaaaaaaaat?
- then it's just a humorous way of saying "Say what?" that I'm guessing isn't referencing anything. It's been used on Family Guy before; Peter is drawing on the glass of an octopus' tank with a permanent marker to make it look like the octopus has a comical expression. He says: "And I'm going to draw one eyebrow raised so it looks like he's saying 'Say whaaaaaaaaaaat?'"
Hope this helps! :D
I believe Seth use the "Say What" from a tv show that use to be on MTV called "Clone High" where Ghandi would say "Say What" just like stewie did in this episode. I could be wrong
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He doesn't really have one any longer but early in the series he used to say What the deuce quite often
Stewie says the word 'what' in many many episodes. You'll have to be more specific.
Ocean's Three and a Half
No.
You know Stewie has alot of enemy..
Stew-roids
Stewie Griffin