Really close friend that is a boy. Almost as if they are siblings.
I really want a boy bsf
by Miley Sasher September 30, 2017
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A boy bsf is someone that will treat you like a sibling but less mean. They will bring you food and give you hugs and cuddle you but it’s all platonic. If you have a boy bsf you are lucky
Girl 1: bro last night Jake brought me ice cream because I was sad, he’s a real boy bsf

Girl 2: LUCKY!! I need a boy bsf
by Ashfern February 22, 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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September 10th is national beat your boy bsf day, this is a day where its ok to abuse your male friends.
Boy- why tf do you keep hitting me?
Girl- because it’s National abuse your boy bsf day!
by Tuna is disgusting September 7, 2022
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