yeehowdy
When you're saying "YEEEEEEHAAAAAWWWWWWWWW!!!" but you get interrupted by someone saying "howdy" so you add "howdy" to the end of the "yee"
You: YEEE- Them: Howdy partner! You: yeehowdy sir...
yeehowdy
The epic combination of yeehaw and howdy.
person 1: yeehowdy!
person 2: hello are you mentally stable?
person 2: hello are you mentally stable?