Bblg is a sub culture of cg/l ( caregiver/little) where instead of having a normal relationship where u call ur dom “daddy” or “mommy” u call them big brother/sister and it’s also a more child like relationship
“ that’s my big brother, he protects me but is stilllike a child” that’s bblg
it sounds gay if u say " hey its my bgf" it can also mean best gay friend so use it properly or u sound retarded b like " u c that guy over there he's my bbgff"