An awful or mediocre film that you expected/hoped would be great simply because Meryl Streep plays a role in it.
I thought "Evening" would be great when I saw the cast, but it turned out to be a Streeptease.
Term used by Streepers, extremely obsessed fans of the fabulous Meryl Streep, to describe how one thing related to Meryl Streep is highly entertaining or pleasurable to look at.
Streeper #1: Hey! Did you see the picture of Meryl from last night's movie premiere?
Streeper #2: Yes! That was totally a Streeptease, very beautiful and attractive!