Phrase used to convey a positive outcome.

From STEM, an abbreviation short for "Science, Technology, Engineering and Mathematics", a STEMlord is a pejorative term for a particular kind of person who has studied in these areas at university or works in these fields who holds a pretentious, condescending attitude to anyone who has studied in any other fields, particularly the Arts and Humanities. They typically believe themselves to be more "intelligent" and "rational", while generally remaining incredibly ignorant outside of their areas of expertise and having the charisma of a rotting pig's backside.

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.

a phrase used when won wins or anticipates a win

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