Source : Webster's Revised Unabridged Dictionary (1913)

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.

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

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

Source : WordNet®

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