Biff 

Dick or penis

"Suck a biff Andrew"
"Eat a biff asshole"

Biff by IammWavy December 3, 2015

Biff 

To slip, trip, fall, or generally mess something up. Generally resulting in embarrassment and regret.

Sam - slips in mud
Ryan - YOU GUYS, SAM JUST BIFFED IT!
Sam - Damn it! That was the worst biff ever, I'm fuckin' covered in mud!

Biff by ChknWngz April 20, 2016

biff 

a fail, messed up,

You biffed it! Why would u even try hitting that huge jump!

biff by FuckDontEvenNeedAFuckingName October 1, 2016

Biff 

A phonetic way to reference a best friend (BFF) or boyfriend (BF).

Girl 1: How's the biff?
Girl 2: He's perf like usual

Biff by P8triarch May 22, 2016

Biff 

When you think you are pushing out a fart but you actually slightly shit yourself, resulting in you having to throw out that 100 dollar Gucci underwear.

On a date with a hot chick.
Dave: "Oh shit I have to fart, but what if she hears? Fuck it."
*Juicy wet fart sound emerges*
Aileen: "What the fuck was that?"

Dave Biffed himself when on a date with a big booty hoe.

Biff by BootyConnosieur February 6, 2017

BIFF 

When the class fucks over one student.

The class fucked over an idiot in lesson. BIFF!

BIFF by Jimbob Larry February 28, 2017

Biff 

Best

Incredible
Fucking
Friend

She's my Biff

Biff by Book-Nerd-on-Reply March 27, 2017