Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
scurror, āri, v. dep. n. [scurra, II.], to act the part of a jester; to play the buffoon (Horat.): scurror ego ipse mihi, populo tu, I play the buffoon on my own account, to please myself, Hor. Ep. 1, 17, 19: scurrantis speciem praebere, of a buffoonish parasite, id. ib. 1, 18, 2.