The term used to describe or refer to a moment (in a film, TV program or even life) that acts as a
complication of sorts. That is, a point
when the "plot
thickens".
Derived from the use of cornflour as a thickening agent when making sauce/gravy/etc. Hence the term, 'Cornflour Moment'.
You're
watching Alias and find out 'The man' is really Sydney's mother.
You say, to be smart-assy:
"And that,
ladies and gentlemen, was what we like to call a Cornflour Moment.."
Or, more simply:
"Woah! Dude! Cornflour Moment!"