Millie 

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?!?!?

Millie by PandOEuropeanFerries January 1, 2009

Millie 

Person with lived experience of mental illness

I'm a Millie. I love music and I write songs about what it's like to live with depression

mental illnessschizophreniadepressionocdanxietyautismpsych wardpsychiatric patientconsumer

Millie by SkyB September 23, 2012

Millie 

(verb)Meaning to have sex with or engage in intercourse with. but also entails doing something dirty.

"Man that girls so fit, she'd get Millie'd. seriously i would millie her anywhere any time"

Millie by Jdawgthecool July 18, 2009

Millie 

Millie is a girl that is attention hungry (attention whore) she is a horrible friend because she only thinks about herself she plays with boys hearts because finn didn’t like her she is the type of person to stab you in the back if you become more famous then her and she’s a slut

Oh there goses millie I use to like her now all I see is a back stabbing slut oh well .

Millie by My definition for people🔒 June 8, 2018

Millie 

Millie Bobby Brown is all perfect🤦🏾 ♀️ Everyone is perfect guys, not only her. I love her but you guys stab her too much!!

Millie I love you, but you’ve changed 😭. With Jacob Sartorious in your heart, will you still see your fans...

Millie by TheWalkingDeadIMissYouCarl March 13, 2018

Millie 

A friend who is always there for them, but changes when she gets inside. She is spiteful to siblings and always stuck to her phone or computer! She loves cartoons and quite well at drawing. She’s very spoilt and always wants more.

Friend: I love Millie
Brother: she’s horrible to me!

Millie by ImAlEaDyTrAcEr! December 3, 2018

millie 

Millenial, but in the offensive form.
Snowflake.
Easily triggered.
Thin skinned.

You got triggered by THAT?!? You're a millie! Left winger millies are easily offended by just about everything.
Often, but not always a democrat.

millie by Pops Fereal February 28, 2020