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The upwards-facing flat plane of the penile shaft, when in boner form.
"Is it annoying when my shnoz rubs against your backboard during fellatio?"

"My balls look fine, but I think you bruised my backboard."
by gartacus February 04, 2012
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4
When you jump in that back(a**) and you ride(grinding) the waves (winding) An you ride it like a surfboard.

synonymous:Grinding ,Riding ,Surfing ,Exotic Dancing.
When work came i had the back-board my girl
via giphy
by 444 + 222 May 12, 2018
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