Definition of d-bags:
(n) :
(with “The”) The City of Detroit.
(n) :
(education, chiefly Canada, US) A grade awarded for a class, better than outright failure (which can be F or E depending on the institution) and worse than a C.
(n) :
(snooker) The semicircle on the baulk line, inside which the cue ball must be placed at a break-off.
(n) :
(soccer) The penalty arc on a football pitch.
(n) :
(field hockey) The penalty arc on a hockey field.
(n) :
(Unicode) Canonical decomposition