Used to describe someone who's attitude or behaviour tends to swing from positive to negative. It can also be used when someone is having a sudden seemingly unprovoked off-day.
Did you notice how D was acting today? He's such a jekyll-hyde.
by Brad S July 1, 2005
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Jekyll & Hyde was a Broadway musical in the late 90's written and composed by Leslie Bricusse and Frank Wildhorn. It's based (if rather loosely) on the novel "The Strange Case of Dr. Jekyll and Mr. Hyde" by Robert Louis Stevenson. The musical enjoyed a decent Broadway run and was a rather good show.
Unfortunatly, towards the end of its run David Hasselhoff was cast in the role of Jekyll/Hyde. He completely massacred the music and sadly his pitful performace has been captured on DVD for all eternity. Fans of the show or "Jekkies" often harbor an intense hatred for Hasselhoff because of the stigma he set for the show.
Jekyll & Hyde has several memorable songs including "This is the Moment", "A New Life", "In His Eyes" and "Bring on the Men" (which was not actually featured in the Broadway version").
The show has a number of devoted fans (Jekkies) and can still be seen all over the world. Recently, it has been annouced that "Jekyll & Hyde" will soon be made into a major motion picture. It is scheduled to come out in 2007 however, the cast is still unknown at the moment. The film is bound to be successful and will most likely result in a surge of the fan base, much like in the case of "The Phantom of the Opera" (perhaps the most extrodinary musical/story ever (I myself have been a proud "phan" for 9 years)). Many fans eagerly await the film's opening and are completely baffled as to who will be in the cast (hopefully not David Hasselhoff).
Person 1: "I just saw "Jekyll & Hyde", it was really good, I was suprised. I've heard bad things about the show, apparently David Hasselhoff used to be in it."
Jekkie:"David Hasselhoff is the bane of my existance. I'll rejoice in his death."
Person 1:".......k...."
by Sikes May 6, 2006
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One of the best Broadway "Grusicals" ever, telling the story of a doctor and his struggle between himself (Henry Jekyll) and his evil alter-ego (Edward Hyde). Music by Frank Wildhorn and Lyrics by Leslie Bricusse.

Jekyll and Hyde is awesome! Why the hell did they cast David Hasselhoff for the main role?! WHAT KIND OF IDIOT PUTS HIM ON BROADWAY?! GO EAT ANOTHER WENDY'S HAMBURGER, HOFF! *stab*
by KayErikPhan March 17, 2008
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A style of parenting that provides a full spectrum of emotional and psychological experiences to a child vis-a-vis the parents’ instability and addictions which lays the groundwork for years of in-depth psychotherapies in which the child, throughout their lifespan, has the opportunity to undo the warp and find some semblance of balance and potentially, a sense of a true self.
Yup, at our house it was nose-to-the-grindstone discipline during the week and then Mr. Toad’s Wild Ride when the weekends rolled around; my parents were practicing devotees of Jekyll and Hyde Parenting.
by Dr Bunnygirl October 12, 2019
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A condition where a person is completely normal/nice from day to day life, and a "monster" or goon while on the ice/field/etc.
Ryan: Hey, you know Zach?
Ben: Ya he's a cool guy.

Ryan: Did you hear he beat a guy up in the game last night?
Ben: Seriously?!?
Ryan: Ya I know, he suffers from a bad case of Jekyll and Hyde Syndrome
by Diagnosis #1 May 15, 2011
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1(n) the worst NES game ever made and is also one of the most hardest. The game starts you off being a man and for some reason everyone wants you dead. When you die (which will happen in thirty seconds) you turn into a monster and get struck by lightning and die.

It is also used for fire kindling
Bob killed himself after playing Dr. Jekyll and Mr. Hyde.
by eman777077 October 5, 2010
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that one fancy book about Dr. Jekyll (aka spamton but softie'd) having a middle age crisis and randomly becoming his evil version aka Mr. Hyde (aka shikyou but gender bender'd) and at the end he uhhh fully becomes Mr. Hyde and kills everyone or something idk i have never read the book
guy 1: hey my guy have you ever read jekyll and hyde?
guy 2: yeah i read it it's pretty cool even though there's 69420 plotholes
by The original sillygirl.png March 18, 2023
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