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
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To completely wreck a plan or goal
When you tell your girlfriend you'll pick her up for a romantic dinner and desert ( ;) )and completely forget her.
" ya biffed it bud!"
by Simple.life January 4, 2015
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When someone hits something really hard, sometimes used in cricket matches when a batsman proper smashes the ball. I think it originates from the old batman show when they had fights with the bad guys. Sometimes words came up in bubble writing when someone got hit, an one of the words the used was biff.
Joe proper biffed a six before
by Tom Tench May 16, 2008
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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.
by BigBiffer July 30, 2020
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A common name of a WASP who has inherited old money and does not have to work for a living.
Oh Bif, let's play a set of tennis.
by Hasbro July 7, 2006
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n. Bif The Wizard; The leek wielding mascot of science depicted as a stick figure. BiF's name originates from the elements Beryllium and Fluoride. Is often associated with the word BiFtastic, meaning absolutely nothing whatsoever.
Dude: That's a BiF if I've ever seen one.
Other Dude: What's a BiF?
Dude: I don't know.
Other Dude: Woah... Deep...
by NNBTK October 31, 2009
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/bɪfd/

1. to be proved wrong when previously displaying a cocky attutude of being right.
2. Generally humiliated in some pride-before-a-fall kinda way
3. to be disappointed, gutted etsech
John was well biffed yesterday cos he asked Kayleigh out and she told him to fook off.
by Ghettoling August 6, 2010
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