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Originally meaning masturbation, though more recently used to describe any sort of activity, scandalous or not.
I caught my little brother smacking toboggan!

"What up mang?"
"Not much broseph, just smacking toboggan."

The band Senses Fail released their Let It Enfold You album with a bonus disc which included a short history and compilation of their early years, "smacking toboggan" is referenced there.
by rburd208 March 15, 2009