byf 

"Before You Follow" - used on social media, most often to make sure nazis or pedophiles don't follow you, or if you run a nsfw blog, to make sure minors don't follow you

byf please don't follow me if you are under 18

byf by VisualVexation April 7, 2017

BYF 

“be your friend”

I JUST WANT TO BYF

BYF by ilovedogs256 February 14, 2019

byf 

Brick Your Face. As in, throwing or smashing a brick into someones face.

I should BYF you bastard.

byf by Hunchback September 12, 2005

byf 

Stands for Before You Follow. Used on Tumblr by the type of people who get called "Tumblrinas" and "Special Snowflakes" unironically by even more pathetic, fedora-toting, anti-SJW types.

Usually read as"don't follow if you are a shitty person or if you disagree with me in any way or think you are the same fictional characters that i think that i am! ask to follow if you are spacegender, goblinkin, or are named Brad!"

if you dont read my byf before following you should kys okay thanks bye!

byf by lesinar January 5, 2017

My Name is Byf 

A youtuber that does lore recaps for Destiny 2. Sometimes known as Lore Daddy or Daddy Byf.

"I dont understand this game" "did you watch My Name is Byf's new video.

My Name is Byf by car_fucker March 11, 2021

Byfsismcdab 

Byfsismcdab is the short form of "Bitch you fucking stupid idiot suck my cock dumbass bitch", it is the highest form of insult possible, use it on someone while aruing to get the upper hand.

Dude 1: Uh Hu? WELL UR MOM IS FAT

Dude 2: Ok and?

Dude 1: NO ONE ASKED NOOB

Dude 2: Shut up Byfsismcdab

Dude 1: OMG UR SO SMART IM SO DUMB I HAVE NO IDEA WHAT TO SAY BACK TO THAT
*Dude 1 Has Left The Chat*

Byfsismcdab by VvgoproZ March 6, 2023

byfacebookers

A person who is present at an event without participating in it - like bystanders - but on facebook.

Person 1: "Do you really think i'm the sort of person to be sympathetic to whining angsty teenagers?"

Person 2: "Nah. We're some of the lucky/awesome few, I say *glares at byfacebookers*"

byfacebookers by softpearsftw September 5, 2009