Short for Millennial, as in the Millennial Generation, a retort, usually used disparagingly in response to a Millennial trying to put down an older person as in "Okay, Boomer. You’re trying to sell this as something cool? We're not falling for it."
Okay, Millie. Yours is the generation that is voting overwhelmingly for left wingers. You ARE falling for it.
by hoipolloiboy November 30, 2019
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Millies are some of the pengest tings around, when u meet a millie treat her well because if you don't she can get very sensitive and upset and its horrible seeing a Millie upset because she always helping others and making them feel better. They have amazing body's and perfect hair and amazing at makeup. There usually popular but sometimes not but they don't care! As long as there happy it's fine for them.
Guy: woahh who's that she's perfect
Girl: oh that's millie! She's sooo nice!
by chickenwingzzz6709 August 24, 2018
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Millie is a girl that is great at all sports, she normally puts others first and makes them feel good. Sometimes can get heated but always is nice after. Millie is also a hot female and she is always up for a chat.
by Anteater01 March 10, 2019
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She is a sweet person that tries to sneak up on people. She is complimented a-lot on her looks by her friends and naturally gains friends that trust her. She is good at playing musical instruments like the drum.
Im just waiting for millie to reply to me on snapchat
by E.Than101 December 16, 2019
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A hot blonde girl with glasses who’s a nerd and also has a Willy
Omg Millie is so fittttt
by StrokinMyDick December 23, 2021
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Used to refer to a Friends Girl Friend, that has caused your friend to irreversibly change, they may never come out any more, drasticly change their music taste :O or even turn them into an emasculated bitch, who no longer has any thought of their own, and is forced to drink Bitch Drinks

It is derived from when a strapping young manly lad, into hip-hop, explosions and hard liquor, met a lass, this crazy woman cast a spell on said man, and now he leads a life of seculsion trapped in his room, listening to "soft rock" sipping on WKD's.Until he hears the Mighty Hippo Roar, and he will scurry off and clean her pipes! leaving his man dem standing around wondering why hes not comin out drinking.

Callum : Sorry Guys im staying in tonight, me and Girlfriend are staying in and straightening my hair.
Smacs : OMG!!! your girlfriend is such a millie!
Callum : How did you know her name?!?!?
by PandOEuropeanFerries August 6, 2007
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