The one boy who will take on any role in a girl's life. Usually an attempt to be unofficially a permanent part of her life.
When you're taken, he often is the best guy friend.
When you're dating a loser, he breaks you both up.
When there's trouble, he's the big brother.
When you're single, he will often date you as long as you have no one. Occasionally can turn into very intense flirting.

Can be sexy, kind, funny, talented, stylish, passionate, romantic, even adoring or very attractive.
Quite often is charming and extremely kind but has a low chance of being married due to a complex issue in his life.
Every girl needs a multi-purpose best boy.
Girl: My ex is being so mean!
Boy: I'll kick his ass! You just go get dressed up pretty and we'll go to the mall. When your ex is around, you can be clingy to make him jealous! Deal, sweets?
Girl: Oh yeah! I'll make sure I look really nice for him to see us in public!*I love my multi-purpose best boy!*
Boy: That's better! I'll spike my hair so we look good together. Hold on babe. :D
Girl 2: OMG! I need a guy like that!!!
Boy: I'm her multi-purpose boy so I'm taken!
by ArcticIceAngelFlames March 21, 2011
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Just riri. i love him with my entire heart and he deserves the whole world cuz he

the sweetest lil boy on earth.
Riri?

Riri best boy <3!!!!
by minimimi2s September 2, 2020
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some you can talk to about anything don’t judge you protective over you don’t try to date you talks about other ppl with you listens to you complain about everything and makes your u fell better when your sad someone you can trust with anything someone that won’t start drama about dumb stuff FaceTimes you for no reasons texts you just to see if your ok understands you and loves you like a sister
Hey Lacey my boy best is better than yours .

Hey me and my boy best have plans this weekend
by Sksnsj September 25, 2017
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Someone you fall in love with without even knowing it. They are a person that is always there for you, which makes you feel important. They are a person that is trusting, which makes you feel safe. They are a person that cares for you, helps you, loves you. Which makes you, you guessed it, fall in love with them. Some boy best friends are in love with you too, but some aren't. This person will hurt you without knowing. You will remember their smile, laugh. How they talk, how they move their lips, how they find every little thing funny. it just makes you love them more, but hey, you can't help it. It's okay, I can't help it either.
Someone: "Are you guys dating?"

Me: "No... that's my boy best friend.."
by LoSeR_LoVeR October 4, 2017
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literally there whenever you need it. don't have a bf ? get a boy best friend they're comforting whenever and aren't ever gonna screw up your feelings like an actually boyfriend @ caiden @ keith :)
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A boy best friend will be there for you, someone you can tell everything to. He knows the difference between “I’m fine” and “I’m great”. He knows when something is wrong and won’t stop asking until you tell him because he doesn’t want you to feel that way and want you to be happy. He will say goodnight and good morning every day. He’s going to tell you if a guy isn’t good enough because he doesn’t want anyone to break your heart or hurt you in anyway. He wants you to stay you and not let a guy let you down. A guy best friend is someone who tells you everything every little detail. He’s going to tell you all the guns he has in his video games his collection of shoes, and his tricks he can do. If he does have a girlfriend he will make you guys best friends no matter how jealous she seems because it’s the two girls he cares the most about, and at the end of the day even if he doesn’t say I love you inside he does and deep down you know he does.
Are you and Justin dating? No way he’s like my brother hes just my boy best friend
by Sad hours August 6, 2018
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