Girlies are the girls that are nice, positive and uplifting to other girls, and don't demonize hyper-femininity.
If you put a word before girlie, its a girl that likes or relates to that thing that thing like "Your piano song sounds amazing your such a piano girlie!"
Example one:
"I love your outfir girlie!!"
"Omg thank you your literally so cute!"
Example two:
"The house I'm painting just does not look right"
"I would help you but I'm not really an art girle but your doing amazing queen!"
A girl with a very gorgeous butt.
Wow that girl has a nice girly butt!