Freddie Wilson is a singer of a Village People-like band mentioned by Tobias. Assumably he is quite expressive, as Tobias was sarcastically drawing a similarity between him and the mumbling George Michael. Tobias tries to save face when Michael and Lindsay don't recall who he is, but the neverending question of Is Tobias gay? lives on. ("S.O.B.s")
Lindsay: You should send George Michael to Openings, too.
Tobias: Yes, it could help him express his feelings.
Michael: My son expresses himself just fine. Isn’t that right, son?
George Michael: What? Yeah... that's fun? Yeah I guess... I don’t care. Stop.
Tobias: Yes, he’s a regular Freddie Wilson, that one.
Michael: I don’t know that reference.
Lindsay: I don’t either.
Tobias: I don’t know either.
Narrator: It’s this guy.From "S.O.B.s"