What is "yankee-doodle"

Yankee-Doodle \Yan`kee-Doo"dle\, n.

1. The name of a tune adopted popularly as one of the national airs of the United States.

2. Humorously, a Yankee.

   We might have withheld our political noodles From knocking their heads against hot Yankee-Doodles.
   --Moore.