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The act of jumping into a bathtub filled with ice and cold water and completely submerging yourself while wearing a pair of goggles. As seen in the Zach and Dave Show youtube video SUBMERGING.
"Hey what are you up to tonight?"

"Not much."
"You want to try Submerging?"
"Let's do it, I'll get the ice and the goggles, you provide the bathtub."
by Crazy Larry III March 03, 2012