Scary Mary. A girl who obsessed with the way she looked. She would always look in the mirror and say how pretty she is, she would always put on her grandmother's dress and look in the mirror. Not until the fire broke out. She didn't realize it until it was too late. Now her face is all gnarly and burnt. She wants your face.
How's it used in a sentence was by trying to figure out how I would say the origin of Scary Mary. But if because I forgot the origin but that's how i would describe the story of her. I feel sorry for her.
by YuriKatsuki_24 November 5, 2017
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1. Is a Mary who at times is a very nice person, and can appear almost dumb most of it. With a flick of a switch will become Scary Mary, she will throw phones at your face, she will slam you into walls, she will scream all of the swear words at you no matter where you are, and she will have sex with your friends as you walk in the door from work and allow you to watch. She will trun your family against you and convince your kids you are a terrible person. Scary Mary will also bear false witness and lie to get her way.

2. Scary Mary is Scary and loves the D and your money. She is making love to Pat Rick while Har lie Man Ger sits at home and takes care of the children. Plan B lives under the mattress in the house because she never knows who's kid it is.
Well scary mary is being scary today, let's go fishing.
by The Longest Yard November 29, 2022
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Someone who can be nice at times but then can be very mean and very scary, therefore becoming their alter ego, Scary Mary.
"Yeah, she was really nice 2 minutes ago, but then something happened and she became Scary Mary."
by regina george got hit by a bus October 12, 2020
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A unattractive woman who wears spandex while practicing witchcraft. There is never a time a cake or cookie is far from her grasp. Her favorite saying is “the devil made me do it.”
Damn, that girl is A Scary Mary
by Booooomerrr! October 1, 2019
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The woman from the phones for you advert

some woman with long greasy hair who looks scary and could be called mary
whats up scary mary

look at scary mary over there
by frida the cow July 30, 2005
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a female student of BCA who believes that all guys are conceited, egotistical, sex-obsessed spawns of satan that deserve nothing more than castration, followed by a long and painful death.
Joe: Yo Bob! This morning I woke up, looked under my pants and noticed my balls were missing! Its freakin' me out!
Bob: It must have been...SCARY MARY!!!
by FlyingNinja April 1, 2005
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1. a contestant on the channel 4 show, big brother who was a witch and a phsycic. Lived in Donegal (ashamedly left first)

2. From the phones 4 you advert; a fat girl with greasy hair who isnt scared of her own phone but herself.

1. Scary Mary,"boo! your a real loser!"

2.man: Scary mary you look scared of your own phone
mary: i am its costing me a fortune
man: you should get a wee shitty phone from phones 4 u. No 1 else has!
by Damian Friel September 21, 2005
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