Someone who is way too grown to be crying/whining over petty shit. Could also be someone who looks strong, but is scared/can't fight. A person with no backbone, and who complains and or shows weak traits when confronted with real life shit.
Baby Back Bitch (BBB): What is a baby back bitch?
Someone who is whining acting like a bitch or that is annoying you. a person that needs to suck it up and stop crying about stupid things.
"Aaron is acting like a BBB today and he needs to stop it!"
"I hate how he is being a baby back bitch it is bringing down the mood"