A Yulen believer is a t.A.T.u. fan who doesn't want to believe that the 2 female members of the group were not romantically involved with each other. Yulen comes from taking the first 3 letters of each singer's name:

YULia and LENa

Though both singers deny this relationship existited there are still many Yulen believers amoung fans around the world. You can find them filling up forums with 'fan-ifctions' that involve the girls being in some sort of loving relationship.
Non fan: "Tatu pretended to be lesbians for money"

t.A.T.u. fan: " Tatu were forced to portray lesbians by their producer Ivan"

Yulen believer: "No they are pretending to be straight and they still love each other!"
by Here-I-am August 07, 2011
Get the Yulen Believer neck gaiter and mug.
1: he gonna kill somebody.
2: ya thinks so?
1: best believe, man. best believe.
by KRHimself September 08, 2004
Get a best believe mug for your boyfriend Vivek.
The words trust and believe used in one conjunctive term. It's used to signify ones assurance of a certain subject.
I will be there on time babyboop, trust and believe.
by guy000000000 November 14, 2008
Get a trust and believe mug for your friend Helena.
Just a way of saying, you can bet on something to happen if a another event should occur
Person 1: I heard Rosa said she was going to fight you

Person 2: if she touches me best believe I will whip her ass
by tacoboutit July 02, 2017
Get a Best believe mug for your fish Sarah.
One who believes in his or her capabilities, one who is confident enough to handle life efficiently.
Achievers are true Self-Believers.
by Raju45 August 10, 2018
Get a Self-Believer mug for your girlfriend Sarah.
Baldo Waldo is the King Believers.

A large group that originated from the Ushi No Tane Forums; most of the members are incredibly good people and are good friends with one another.

Originally made because of a character in the Harvest Moon series, Thomas, who is believed to be the Harvest King.

Their evidence includes the fact that he always, ALWAYS returns the dog ball you "lose" no matter how you get rid of it (or if you let it sit for too long), he breaks into your house on Christmas, he teleports, the Harvest Goddess has called the Harvest King a baldy, and, well, Thomas is a baldy. These are few of the many reasons they believe for.

The club died on its second anniversary on August 17th, 2010. May it rest in peace.

Let the members always remember the good times and the bad, the wars the the games, the love and the hate, the friends and the trolls.
BWKer: Did you see Thomas in the new Harvest Moon game? (・A・)

BWKer #2: Yeah, we should report to BWK that he's stalking us in YET ANOTHER GAME.

BWKers: YESH 8D OUR FELLOW BWK BELIEVERS WILL BE PLEASED <3
by somerandomkidrightthere August 17, 2010
Get a BWK Believers mug for your dad Manley.