Referring to the latter part of your post, that was my best guess, as well; just thought I'd get someone else's opinion. That or, "Weegee is the TOP", but either way it doesn't make much sense. I haven't played any of the N64 Mario Party games for a very long time, so I wouldn't know if those voices are in any or all of them. I can say for sure that that's not at all like Luigi's voice in the American version of Mario Kart 64, which sounds about the most like his current voice that it ever was in the N64 era.
And if my earlier [much, upon re-viewing] post is any indication, I agree that those Wario clips are hilarious. I keep trying to imagine modern Wario saying that with proper animation and/or mimicking his supposed facial gestures every time I listen to them. Those third through fifth ones crack me up about the most, though.