Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
incrassātus, a, um, Part. and P. a., from incrasso.
in-crasso, āvi, ātum, 1, v. a., to make thick or stout (post-class.; used mostly in the part.), Tert. adv. Psych. 6.
Hence, in-crassātus, a, um, P. a., made stout, fattened, Tert. adv. Marc. 3, 6; id. Jejun. 6.