[Stelmaria]

Apparently it's a thing in America!

[PowerShell]

Live 25 years in Wisconsin and never heard of it.

[Satanbobsantapants]

Live 25 years in Wisconsin and never heard of it.

probably referring to the polar plunge
where a group of people strip down and go into snow/ice covered lake
it's popular in my neck of da hoods

[Stelmaria]

Live 25 years in Wisconsin and never heard of it.

Best you don't or you might lose some IQ points.

[PowerShell]

probably referring to the polar plunge
where a group of people strip down and go into snow/ice covered lake
it's popular in my neck of da hoods

Polar plunge is just called polar plunge. I know what that is. It's done to raise money for charity.