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]

Moby Thesaurus II by Grady Ward, 1.0:

82 Moby Thesaurus words for "thumping":
   awful, banging, barrage, beat, beating, behemoth, bumping,
   clicking, colossal, complete, deadly, dreadful, drum, drum music,
   drumbeat, drumfire, drumming, elephantine, enormous, fearful,
   flutter, fluttering, frightful, gargantuan, gigantic, great,
   horrible, howling, huge, immense, jumbo, mammoth, massive,
   monumental, palpitant, palpitation, paradiddle, patter, perfect,
   pitapat, pitter-patter, pound, pounding, pulsation, rat-a-tat,
   rat-tat, rat-tat-tat, rataplan, rattattoo, roll, rousing,
   rub-a-dub, ruff, ruffle, slapping, spanking, spatter, spattering,
   splutter, spluttering, sputter, sputtering, staccato, stupendous,
   tat-tat, tattoo, terrible, terrific, throb, throbbing, thrum,
   thrumming, thundering, ticking, titanic, tom-tom, unmitigated,
   utter, walloping, whacking, whaling, whopping