BFF has two definitions
the most common of which is : Best Friends Forever

the other is the complete opposite and is: Big Fat Fuck

A phrase to describe someone who is cognitively degenerating. Synonym of "going off the deep end". Can have varying degrees of severity.

Reference to the song "Hey You" by Pink Floyd. The line "and the worms ate into his brain" makes no sense in an otherwise linear and literal narration throughout the lyrics.

Acronym - Best Friends Forever

Your "Best Friend Forever". Someone you know you can trust. A sibling from another parent. The one friend you hang out with the most. Someone who will laugh when you laugh, cry when you cry, and smile when you smile. They will stand up for you, and they will listen when you blab on and on about all of life's problems.

A person who will be There for you and never lie or take your ex boyfriend. A person who you can trust. A kind,loyal,and nice person. Who doesn't care what you wear or look like. Someone who gives you compliments everyday. Someone who hugs you . Who supports you in every decision. Who will help you when you hurt.

Like, best friends for EVER

As seen on an episode of 30 rock.

BFF stands for "butt fucking festival"