Definitions containing the term double back

What does double back mean?

EBP	Exhaust Back Pressure Governmental » Transportation
BOH	Back Of the House Community
BOH	Back Of the House Academic & Science » Architecture
BG	Back Gammon Community » Sports
CMB	Call Me Back Internet » Chat
DK	Double Kill Governmental » Military
HOB	Hang On Back Community » Sports
DD	Double Diode Academic & Science » Electronics
TBI	Texas Back Institute Medical » Hospitals
CB	Cursor Back Miscellaneous » Unclassified
DG	Double Gun Governmental » Military
DPN	Double Pointed Needle Business » Products
DQ	Double Quantum Miscellaneous » Unclassified
FB	Flat Back Business » Products
BFD	Back From the Dead Community » Media
DG	Double Garage Community » Housing
SB	Strong Back Business » Positions
DBT	Double Blind Testing Medical » Laboratory
DJ	Double Jump Community » Sports
TPB	Trade Paper Back Community » Media
CB	Centre Back Miscellaneous » Unclassified
DT	Double Taper Academic & Science » Mathematics
BI	Back Illuminated Computing » Hardware
DJ	Double Jumping Community » Sports
WDS	Washington Double Star Catalog Academic & Science » Astronomy