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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"
Biffing by Lordy_UK March 31, 2010
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If someone is "biffing" they are lying or exaggerating about a situation. It can also be used by calling someone a "biffer" if they are known to lie.
He's a big BIFFER, ket sniffer, clit flicker.
Oi! Quit biffin you little rapscallion!
Mum's comin' up da stairs! nah, quit biffing bro.
Biffing by BigBiffer July 29, 2020
Yo that motorcycle was biffing it
Biffing by FRIGMS July 20, 2022
To creep, to be seen and not heard.
Biff opened the group chat and didn't say a word. Hes biffing
Biffing by Jervisa February 8, 2017
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!
biffing by Dylanomgwtfbbq April 8, 2008
"I'm biffing hard"
Biffing by Steph September 14, 2003
Biffing, is the act of a dominant other ramming a long metal tube up your butt, and pumping blue ooze into your blood stream. This is not a sexual act.
Mr. Biffit, spent his whole summer biffing all the boys at summer camp.
Biffing by Mr.biffit May 5, 2024