A girl who is very clingy, sweet, innocent or just very childish/immature.
People who Identify themselves as puppy girls normally are very hyper, most likely have adhd, they get very excited when they see their friends/lover.
Puppy girls are also massive people pleasers, in hopes they can get everyone in their friend circle happy all at the same time is tiring.
Alex is such a puppy girl, she follows her bf around like a dog so much!
A girl that is a pillow princess and wears dog ears and a puppy tail sometimes. Most commonly known as a woman who is loyal and believes in Black Lives Matter. Puppy girls are notorious for being democrat because, like dogs, they believe everyone deserves some love and equality.
An adult female human who roleplays as a dog in a BDSM petplay relationship known as puppyplay. This can focus on humiliation and degradation or simply on being be an adored pet similar to the way a little is cared for in age play.
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My wife feels humiliated when I make her be my puppygirl but she looks so hot when she's naked on all fours wearing her collar and she likes the treats and the head scratches.