Phrase used to convey a positive outcome.

Winner Winner Chicken Dinner
The legend tells that years ago every casino in Las Vegas had a three-piece chicken dinner with a potato and a veggie for $1.79. A standard bet back then was $2, hence when you won a bet you had enough for a chicken dinner. !”

The legendary words most Battleground players never see...

To win something, usually of small importance, as in a carnival game. The phrase is used to signify the value of the prize. As in a chicken dinner can be had for the same value.

Knottsberry farm - was a fried chicken & boysenberry jam place back in 70's with a line going around the block they included games and rides to keep the kids from being restless. If you threw 3 bean bags in the chickens mouth you'd win a chicken dinner and they'd yell Winner Winner Chicken Dinner Hence the phrase

a phrase used when won wins or anticipates a win

.......a phrase used during the late 60's early 70's at "trap league" "Meat Shoots" in Waseca, Minnesota. (sportsmen who shoot at flying clay targets in lieu of live animals)

Individuals, or teams would gather on Wednesday evenings and Saturday mornings, to shoot clay pigeons.
The team and or winner would win a frozen chicken(s) (meat shoot) to take home to eat...... the announcer or competitor would yell out "winner winner chicken dinner"