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1.
Having unprotected sex (raw, not wearing a condom).
Also called Bareback
I know I should use protection, but there is no feeling better on your dick than riding the bitch bearback.
by DipNBear July 19, 2006
 
2.
A person with massive hair-growth on his (in some instances, her) back. Homonymous with "bareback"
Ron Jeremy is a bearback.
by True Poet July 14, 2005