look up any word, like blumpkin:
 
5.
The act of sex with a spina bifida sufferer.
"I was biffing this bitch, she was coughing shit up everywhere, like bits of her lungs ands shit."
by trashcanglam February 05, 2005
 
1.
to kid arond, to joke, just messing wit someone.
whyd you do that man your so fucking gay!
what?
yo man i was just biffing!
by IronHead October 22, 2003
 
2.
An Auto-Antonym, can mean to do something with great vigour or with little enthusiasm. Context specific.

1. To attack something with vigour. Evolved from the noun Biff meaning a sudden sharp blow or punch

2. To have sex very enthusiastically. Linked noun Biff.

3. To stroll about meaninglessly. Origin unknown.
1. Brigadier Ben Ritchie Hook in Evelyn Waugh's Sword of Honour Trilogy: "Time for a Spot of Biffing!" (In reference to attacking the Enemy during the Second World War, immediately before he storms a pill box, alone, armed only with a machine gun and grenades)

2.
D: "I heard you biffing last night O, keep it down next time"

O: "Sorry D, I had no idea I was so loud."

D: "Its alright man. It was pretty funny actually, you sounded like a cavalry charge"

3.
D: "How was your day?"

O: "It was okay I guess. I biffed around town for a bit, but it was pretty pointless"
by Lordy_UK March 31, 2010
 
3.
Pissing, shitting, throwing up, having a bloody nose, and crying. All at the same time.
We were doing the All American Challenge and I started biffing and my team won!
by Dylanomgwtfbbq April 07, 2008
 
4.
To be baffled whilst under the influence of ketamine
"I'm biffing hard"
by Steph September 14, 2003