GettyMegan Fox stuck her tongue out at SAG-AFTRA this weekend with her Halloween costume -- or so she thinks anyway ... 'cause her movie-inspired costume is actually pretty old.
The actress made sure to call out her union Saturday by throwing up shots of her getup this year -- Gogo Yubari from Quentin Tarantino's "Kill Bill: Vol. 1" ... which came out way back in 2003. Naturally, alongside her was her BF Machine Gun Kelly dressed as Uma Thurman.
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