The Collaborative International Dictionary of English v.0.48:

Whang \Whang\, n. [Cf. Thong.]
   A leather thong. [Prov. Eng. & Colloq. U. S.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Whang \Whang\, v. t.
   1. To beat; thrash; bang; also, to throw, hurl, or fling
      about, violently. [Scot. & Dial. Eng.]
      [Webster 1913 Suppl.]

   2. To slice, esp. in large pieces; to chop. [Scot.]
      [Webster 1913 Suppl.]

The Collaborative International Dictionary of English v.0.48:

Whang \Whang\, n.
   1. A blow; whack. [Dial. or Colloq.]
      [Webster 1913 Suppl.]

   2. A large piece or slice; chunk. [Scot. & Dial. Eng.]
      [Webster 1913 Suppl.]

   3. Formerly, a house-cleaning party. [Local, U. S.]
      [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

whang
    n 1: the act of hitting vigorously; "he gave the table a whack"
         [syn: knock, belt, rap, whack, whang]
    v 1: beat with force
    2: propel or hit with force; "whang the ball"
    3: attack forcefully; "whang away at the school reform plan"