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1.
If you're southern, got a little redneck in you or you're happy you can say YEEHAW!
Bill: Here's your lottery winnings, all 1 bachillion gazillion of it!
Will: YEEHAW!
by Oz March 03, 2005
 
2.
An interjection of excitement, generally indicative of delight. Note: The more the pronunciation is drawled (slowed down), the more it is emphasized.
Yeehaw! I just wiped out the entire red team, and I still have 4 health points left. Ownage!
by Dr. BAMA September 03, 2004
 
3.
A non descript exclamation which usually accompanies alot of hooting and whistling at whatever is causing the excitement. Most likely coined in the southern states of north America (eg Texas). Can also be used to punctuate traditional country and western music.
It might also be exclaimed by the rider of a bull or bucking bronco at a rodeo or their spectators.
Whilst at the rodeo the rider of the bucking bronco yelled;

"YEEEEE HAWWWWWW!"
by Dacarlo April 08, 2004
 
4.
A shot of Jack Daniels chased with a double shot of fresh squeezed OJ. Yee Haw!!!
Bartender, whip me up a good ol' Yee Haw!!!
by Rev. ToneZone July 17, 2009
 
5.
/ˈji/ /hɔː/

Oft conflated with gee haw: right and left, respectively, TWO commands for controlling a beast of burden with respect to the current path. The current expression is the result of the phonologically entertaining velar abandonment of gee /dʒiː/ for slothen vowel yee
"YEE," let's not fall into the fathomless crevasse. "HAW," let's not flip the caravan riding up the embankment. Yee Haw itself is befuddling
by Hellion Shores June 01, 2013
 
6.
a bunch of rednecks
ay, look at all dem yeehaws over there
by chillikeaicecube May 26, 2009
 
7.
1. What a cowboy or redneck might say; equivalent to the urban "Yeah!" or "Woo!".
2. A stupid redneck.
1. Yee haw! Boy howdy!
2. Look at that yee haw blowing into his jug and dancing like a monkey.
by SC.Zee April 01, 2004