Millie is a character that is married to another character named Moxxie
Both characters are from an adult animated web series called Helluva Boss that was created by VivziePop, which can be found on YouTube
Millie is commonly known as just "Moxxie's wife"
Many people's reasoning for this is that from their perspective, they do not see much of how she is outside of Moxxie, and most of the things she does revolve around Moxxie
So, when someone uses the term "Millie Syndrome", what they mean is that the character is severely underdeveloped and their existence seems to revolve around another character as a whole
Both characters are from an adult animated web series called Helluva Boss that was created by VivziePop, which can be found on YouTube
Millie is commonly known as just "Moxxie's wife"
Many people's reasoning for this is that from their perspective, they do not see much of how she is outside of Moxxie, and most of the things she does revolve around Moxxie
So, when someone uses the term "Millie Syndrome", what they mean is that the character is severely underdeveloped and their existence seems to revolve around another character as a whole
by MeatballDog February 3, 2024
Get the Millie Syndromemug. by Crameron October 2, 2021
Get the Milliemug. Two beautiful girls who love the attention of the males but are also have attitude problems and fat heads
by 0151yema August 6, 2019
Get the Millie and elliemug. by big man me November 22, 2021
Get the Milliemug. Millie is one of the cutest people you will ever meet.
She is kind and caring and sweet and amazing and nobody will ever beat her.
She looks gorgeous and has a really cute smile, but her height may be slightly intimidating to some guys.
She is kind and caring and sweet and amazing and nobody will ever beat her.
She looks gorgeous and has a really cute smile, but her height may be slightly intimidating to some guys.
by IdkNgl January 6, 2022
Get the Milliemug. 
A girl u can fall in love with imidetally i love her sm and she is the best in the world u couldnt ask for anything better
Millie is amazing
by Annie)7392 January 12, 2021
Get the Milliemug.