specu-lying

Making a false statement with deliberate intent to deceive, but based on a theory that may actually be true. From Arrested Development, Season 5, Episode 7 ("Rom-Traum").

George-Michael Bluth: I think you were right. They were together in Mexico, and that's why my dad has been weird with me.

Maeby Fünke: Wow, I was just specu-lying.
George-Michael Bluth: Well, you nailed it, Buttons.