1. The sound one makes after being told an extremely bad, old and/or corny joke.

2. A way to describe an old, obvious and/or corny joke.

Derived from the trumpet sound from the golden age cartoons after a very obvious joke or gag was performed.
Example 1:
Roger made so many bad plays on words, in leiu of calling himself "funny" he called himself, "Punny."

The crowd responded with a "WHANT WAH!"

Example 2:
The joke was so bad it was referred to as a "whant wah" joke.
by Rick0307 September 20, 2006
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