In a reference to the song "Mr. Brightside" by the Killers, a brightside is someone who is jealous of his/her ex's new beau.

"He takes off her dress now
Let me go
And I just can't look
It's killing me
And taking control"
"Destiny is calling me
Open up my eager eyes
I'm Mr. Brightside"
by Catmka March 07, 2005
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Someone who pretends to be happy when they're not, referring to the confused bisexual narrator of The Killers' album Hot Fuss.
But it's just the price I pay
Destiny is calling me
Open up my eager eyes
'Cause I'm Mr Brightside
by Zythe November 02, 2005
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The act of spinning a positive outlook on any situation no matter how depressing it may seem.
by ckello2 June 09, 2011
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Mr Brightside or a Brightside is someone who is jealous of another person who is with the person they want. This is taken from The Killers' song Mr Brightside.
"And I'm falling asleep, and shes calling a cab, while he's having a smoke, and she's takin' a drag, now they're goin' to bed, and my stomach is sick, and its all in my head but she's touching his ... chest now, he takes off her dress, now LET ME GO"

"Jealousy, turning saints into the sea, swimming through sick lullabies, choking on your alibi, but its just the price I pay, destiny is calling me, open up my eager eyes, cause I'm Mr Brightside"

by Craig McCombie October 29, 2006
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A guy who has terrible luck with with girls, or anyone who catches a lot of tough breaks in general.
- 'But it's just the price I pay, Destiny is calling me, Open up my eager eyes, Cause I'm Mr. Brightside'

- "wow the girl u like just started going out with another guy... better luck next time mr. brightside."


by ajaku3714 February 24, 2008
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"Did you see that kid at the party last week?"

"The one who was having way too much fun cleaning the bowl?"

"Yeah. No doubt he's a Billy Brightside."
by Barrel Rolls January 23, 2007
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Someone who knows his girlfriend is cheating on him, or at least messing around with a bunch of other guys, but chooses to ignore it because he can't resist her.

Made popular by The Killers's song, "Mr. Brightside."
"Dude, Jeffery's girl is over there making out with some guy! Does he know about it?"

"Yeah, but he's a Mr. Brightside, so he just ignores it."
by Allison Silsbee November 08, 2009
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