Wang-dang-doodle

The meaning of "whang-dang-doodle"?

I'll do some research. But from the song lyrics, I'm thinking PARTY.

Tell Automatic Slim , tell Razor Totin' Jim
Tell Butcher Knife Totin' Annie, tell Fast Talking Fanny
A we gonna pitch a ball, a down to that union hall
We gonna romp and tromp till midnight
We gonna fuss and fight till daylight
We gonna pitch a wang dang doodle all night long
All night long, All night long, All night long...

The Urban Dictionary says:

To a pitch a wang dang doodle is to have a good old fashioned Saturday night filled with drunken revelry, which may include but is not limited to fighting, dancing, singing and the like.
See also the song by Willie Dixon of the same name. (See above)