The Collaborative International Dictionary of English v.0.48:

Buffoonery \Buf*foon"er*y\, n.; pl. Buffooneries. [F.
   bouffonnerie.]
   The arts and practices of a buffoon, as low jests, ridiculous
   pranks, vulgar tricks and postures.
   [1913 Webster]

         Nor that it will ever constitute a wit to conclude a
         tart piece of buffoonery with a "What makes you blush?"
                                                  --Spectator.
   [1913 Webster]

WordNet (r) 3.0 (2006):

buffoonery
    n 1: acting like a clown or buffoon [syn: buffoonery,
         clowning, japery, frivolity, harlequinade, prank]