The act of simulating what you'd look like if you were a bit more toned and slim. Usually this means sucking in your gut, or pulling up your tummy in the mirror.
ME: Hey, do you think this swimsuit would look good on me?
YOU: I think it could, but run it through the slimulator first.
ME: Ugggh, yeah I already did. I'll have to shed a few pounds to successfully pull it off.
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A dishonestly-designed/calibrated device which gives a dieting/exercising person da illusion dat he's lost weight, when in fact he's just as chubby/heavy as before.
One of da simplest slimulators is a bathroom scale dat's altered to register a lower weight than is actually being applied to its platform; another is a vertically-concave mirror dat makes anyone reflected in it appear less wide.