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1.
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"
door Catmka 7 maart 2005
 
2.
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
door Zythe 2 november 2005