The act of wrapping one's scrotum around another man's cock, thereby "insulating" the "pipe". This is made easier by first taking a prolonged hot shower, so as to lower "the boys" and loosen the skin.
So-called because of the cold, lonely winter nights in Sudbury, Ontario.
"What did you do after the bar yesterday?"
"We went back to my place, and I gave Floyd the Sudbury plumber."