Definition from Wiktionary, the free dictionary
Alternative forms 
- howdie (noun)
Shortened form of "how d'ye do" (i.e. how do you do) or less commonly "How do you fare?"
- Rhymes: -aʊdi
- An informal greeting.
- Howdy folks, and welcome to our ninth annual chili cookoff!
An informal greeting
howdy (plural howdies)