Definitions of whang:

• noun:   the act of hitting vigorously
• verb:   attack forcefully

  Example: "Whang away at the school reform plan"

• verb:   propel or hit with force

  Example: "Whang the ball"

• verb:   beat with force
• name:  A surname (rare: 1 in 100000 families; popularity rank in the U.S.: #18386)