Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† poppysma, ătis, n., and poppys-mus, i, m., = πόππυσμα and ποππυσμός, a smacking or clucking with the tongue, as a sign of approbation, Juv. 6, 584; on occasion of lightning, as a religious ceremony, Plin. 28, 2, 5, § 25; of a similar sound, Mart. 7, 18, 11.