Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
centussis, is, m. [centum-as], a hundred asses, Varr. L. L. 5, § 170; 9, § 81; gen. centussis, Varr. ap. Gell. 15, 19, 2.
Abl. centusse, Pers. 5, 191.
Plur.: centussibus, Fest. s. v. peculatus, p. 237 Müll.
Hence, in allusion to the law of Faunius, limiting the expenditure on games: Fauni centussis misellus, Lucil. ap Gell. 2, 24, 4.