bf 

"Butt Fuck" The act of placing your male reproductive organ (penis) into the anal cavity of another human or beast.

Jared wants to butt fuck sally.

bf by Shroom January 19, 2005

BF 

To buttfuck or make anal love to.

I will bf her in her fine ass.

BF by Renz of the SG March 17, 2005

bf 

"Bitchy Face". A girl with an extremley bitchy face.

Did you see her at the mall today? Damn, she has a bad case of BF.

bf by unkown May 27, 2003

Bf 

Your boo, man, sweetie, one, S.O., best friend with benefits

Your boy friend, or the person you’re in a commited relationship. In some cases, best friend.

Person 1: My bf and I got together two months ago today 💕
Person 2: Congrats!
Person 1: That little bitch forgot our anniversary.

Bf by yourfavoriteh8r June 5, 2018

bf 

as some people think it may stand for 'boyfriend' or 'bestfriend' it is now confirmed that it means 'big finger'

'oh do you have a bf?'

yes, i have 2 bf's. one on my left hand one on my right!

bf by jazandbob November 29, 2019

bf 

noun
Your best friend.

My bf is a great friend.

bf by Colleen January 19, 2004

BF 

bitch fit.

Katrina: omg omg omg stay out of Niki’s way, SHES GONNA HAVE A BF

BF by young tomato November 14, 2017