Consuming large quantities of alcohol with your best pals and not including unfamiliar acquaintances. Usually accomplished in a more private setting i.e. a man cave.
Yo Holly stop getting hit on by that dude and come over here for a best boys chug.
by colonia December 9, 2010
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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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A guy she fucks without knowing that you know what she's doing
"hey babe do you care of me and my boy best friend go hang out?"
by Nigga big Chicken March 9, 2021
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A guy who gets zero pussy or knows he has absolutely no chance with the girl he likes so he becomes her friend and acts supportive so when shes hurt/in a breakup he can take advantage of her and get what he wanted.
She cheated on me with her boy best friend,
Is that really surprising man?
by Wiseguy1207 August 15, 2022
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A girl's best friend.. who will always be there for her no matter the situation or problem.. When you are sad he will cheer you up by telling you a funny joke or something..He will always give advice when you need it.. boy best friends are the best.
Kammie, is that your boyfriend? No it's my boy best friend.
by Queen Kammie January 10, 2021
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