The Collaborative International Dictionary of English v.0.48:

Thump \Thump\, v. t. [imp. & p. p. Thumped; p. pr. & vb. n.
   Thumping.]
   To strike or beat with something thick or heavy, or so as to
   cause a dull sound.
   [1913 Webster]

         These bastard Bretons; whom our hathers
         Have in their own land beaten, bobbed, and thumped.
                                                  --Shak.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Thumping \Thump"ing\, a.
   Heavy; large. [Colloq.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

thumping
    adj 1: (used informally) very large; "a thumping loss" [syn:
           humongous, banging, thumping, whopping,
           walloping]
    n 1: a heavy dull sound (as made by impact of heavy objects)
         [syn: thump, thumping, clump, clunk, thud]