Howdy
/ˈhaʊdi/
Definition 1 of 1
Pro Tip 1/3Informal Use
Howdy is informal, often used with friends or casual acquaintances rather than in professional settings. 
Howdy, how's it going with the new guitar lessons?
Pro Tip 2/3Regional Flavor
Howdy is associated with Southern and Western American English, giving a regional touch to your greeting. 
Howdy, y'all ready for the rodeo today?
Pro Tip 3/3Friendly Tone
Using 'howdy' often conveys a warm, friendly attitude and can make the conversation seem more personal. 
Howdy, Jenna! That's a lovely dress you're wearing.