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1.
When you purposely fall while snowboarding , and land in a pile of snow causing it to indent making it look like you're in a pool of snow
" Lets do some hot tubbin'"

"Naw the snows way too hard"
by The Walking Glitch March 10, 2010
 
2.
this word came about when me and some friends watned to smoke pot but couldnt because parents were around, so we used common words, one of them was Hot Tubbin'
Everett: are we Hot Tubbin' tonight

Justin: No my moms home
by Everett_Woodward April 01, 2009