The acronym that stands for Boob to Frame ratio. Its a mathematical ratio designed to determine how big a woman's breasts are compared to what her frame should be able to handle. It is used to discern how attractive a girl is when cup size doesn't tell the whole story.
Matt: Dude my girlfriend has bangin double d's!!
Ryan: Yeah... but she has shoulders like a linebacker, sorry bro but her BTF is waaaay too small for me.
Ryan: Yeah... but she has shoulders like a linebacker, sorry bro but her BTF is waaaay too small for me.
by gbabyawesome July 13, 2011
Get the BTFmug. by Theowrites January 3, 2019
Get the BTFmug. by Heybitchitsjoeywoahysbigestfan May 5, 2018
Get the BTFmug. Best Texting Friends. You text this person so mucn, you practically know everything about them. But in real life you guys ignore each other. Love each other over text, hate each other in person.
by candyfreak991 May 8, 2009
Get the BTFmug. The term "BTF" - or big, tall faggot -is a colloquial term referring to a man who is at least six foot four inches or taller that is acting like a jackass. over many decades, the term has transformed to be a pejorative term for stupid bitch.
by flaskofpoop May 4, 2015
Get the BTFmug. 
An acronym standing for "buckin' to fuck." Used to describe a desperate girl that can't wait to fuck the first guy she sees.
by fuzzywuzzywasabear December 31, 2007
Get the BTFmug.