A person who has excessive back fat to the point where it looks as if they are conceling a back pack in their shirt.
"wow I thought that lady had a back pack on but she is just a back pack back".
by the one they call wonka March 4, 2009
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To go on an adventurous trip into the wild with a minimal of tools. Both literary and metaforicly.
Will: Let`s head over into that patch of brambles! and take off your shirt and pants, we`re going bare-backing-back-packing.

Barry: I`ll bring the flashlight!
by rangourthaman July 6, 2009
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