A female defining persons best friend that is a boy, a person that you can put all your trust in, a guy bsf is someone you have by your side, names of people that are often this include: Ethan, Noah, Graham, Brady, and Beau
Oh you know Ethan, he is my guy bsf, he always has my back and gives me the best advice
by SuperiorVenaCava July 16, 2022
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When a girl is crushing on a dude soooooo hard but she’s stuck in the friend zone so she does whatever she fucking can to keep that line between boy friend and boyfriend close to her. How does she do it? By usually becoming close friends with her crush till upgrading him to the Guy Bsf title until he announces catching feels.
Girl 1: Omg i’m crushing on Carson so hard rn!
Girl 2: Why don’t u ask him out?
Girl 1: No way. That’s NOT happening. I have to make it seem like he came on to ME.
Girl 2: How are you going to do that?
Girl 1: Easy. I’m gonna make him my Guy Bsf till he tells me he’s catching feels.
Girl 2: Ur a fucking genius i can’t even.
by An_Upset&ProtectiveFriend September 29, 2019
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What is basically synonymous with best friend or brother-zoning. It is not boyfriend status, so the guy gets no real reward for being there. Typically what happens to guys who try too hard, be it on purpose or on accident.

Generally, the guys who enter these less-than-platonic relationships are soy boys, or beta males who think that women actually find any of that desirable.

The only purpose this serves for the female is to use someone as an emotional tampon.
Female 1: My boyfriend is being a douche rn, but I'm glad you're here for me.

Boy bsf: I'll always be here when you when you need to vent.
by 6ix_6ins April 27, 2020
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Ily bsf means I love you best friend 💛
Hey what did that say?oh that said I love my best friend! Ily bsf💛
by Strizak November 23, 2019
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National Bsf Day is on October 28 show off your bestie
"You busy the 28th?"
"Yes"
"Doing what?"

"Celebrating National Bsf Day you no bestfriend having ass hoe!"
by HitOrMiss69 October 27, 2019
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On April 24th everyone can hug their closest friends to show that they are their favorites
"Hey isn't Lisa ur best friend?then hug her Duhh it's bsf hug day"
by Whatthiscrazy65 April 23, 2018
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a cringy bsf necklace is the definition of Hayden’s josh fp aka hydrajoshh
“hydrajoshh is the definition of a cringy bsf necklace” … “omg I know right
by hyrdajoshhsucks December 16, 2021
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