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Billy Guerin 

American hockey player. Term is used when you are absolutely sure of something during an argument or dispute. It's a "Guerintee".
"Yeah Daryl, your a big lad now but when we were ten, I would have kicked the hell out of you."

"Shut up man, there is now goddamn way you would have kicked my ass, I was the toughest kid in my school."

"Yeah honestly I would, and you can put a Billy Guerin on that"

"Oh fuck really?...you know what, now that I think about it, I really was a bit of a soft lad when I was a kid"
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Bill Guerin

When a certain bet or sports events outcome is absolutely certain and without any doubt, that outcome is referred to as "Bill Guerin" or just simply "Bill" or "Guerin"
My team is up by 20 points with only 1 mintue left. It's "Bill Guerin" that they're gonna win.