"Mon" is "come on" in Scottish. "The Biff" is what fans call the Scottish rock band "Biffy Clyro". Mon the biff therefor means something like "Come on Biffy Clyro". Fans scream this at concerts just before the show and in between songs.
by TheLastCrusade October 31, 2013
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Biff Jansen otherwise known as Sketch of Papa J is man of great importance to those in Northern Hemisphere. He once saved an entire bus of school children by slaying a beast that had taken them captive.
"Who saved my children?" the frantic woman exclaimed. "It was I, Biff Jansen my lady"
by Steve J. Talon April 6, 2010
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To be idle, comes from Big Idle Fat Fucker
Stop being a Biff, Im gong to Biff out now,
by Hireath November 20, 2008
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Someone with a smelly foo/ mooey/ vagina or just used as an insult!
na mate... that girls nasty, she's gotta whiffy biff!!

"GET YOUR BIFF OUT"

dont you just love the smell of biff in the morning ?!

Mate i can smell her whiffy biff from ere

oi love u have one whiffybiff

u know its been a good session when she ends up with a whiffybiff on the journey home

Shut ur legs u biff is whiffy

mate i smashed that lauren last nite and she had a right whiffybiff!!!!

mate have a whif of that biff
by imperialmike October 1, 2009
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A Bedtime Biff is a joint or spliff that is smoked before going to bed. It is often late at night/early morning as it is commonly consumed when its light outside. A Bedtime Biff can also be referred to as an illegal Bedtime, A Bedtime, or an illegal Venger.
Its getting light outside innit
"I'm tempted to roll my Bedtime Biff
by Venger for tea February 8, 2019
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A big fat poon which has just been involved in a long period of sexual activity. The hair on the poon is saturated and sticks to other areas of the poon or inside leg
Wow I fucked that bird so hard last night she had a right smelly wet biff by the time I'd finished with her
by Womb raider April 11, 2016
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A quick tempered, slow witted jock, often in the context of a bully. A Biff often compensates for his lack of knowledge with force or otherwise aggressive action.

The term is derived from the bully in Back to the Future I and II who harassed George McFly not only in has past, but also through the future.
Yo McFly, why don't you make like a tree and get outta here.
by Fred Rogers February 25, 2004
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