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Big fat fucking eye roll, often said in response to a lame comment, or anything regarding Crazy Kevin
Did you see the biffer Kevin just gave me?
biffer by Bobs Johnson June 20, 2004
Someone that fucks everything up just like Diarmuid Brady.
Person without a chromosome

A complete dumb fuck bahahahha
"Oh my fuck, you're such a fucking biffer, you just pulled a Diarmuid Brady"

"Stay away from me! You have the bifferonni!"
Biffer by Cocksucker 420 April 8, 2017
Were on our way to being biffers
Biffer by Beccaboob122 April 18, 2020

Biffer sniffer 

Someone who farts while bathing and bites the bubbles
That freaktard is a real biffer sniffer
Biffer sniffer by Dertwad July 5, 2016

Biffer Plate 

A flat surface or tray used to hold your freshly ground herb. A 'biffer plate' also makes it easier to pass the herb to your buddies.
Yo dude, pass me the 'biffer plate' so I can pack a bong!
Biffer Plate by PitBullStoner April 14, 2011

You fat biffer 

Someone eating or aquiring comically large and/or frequent amounts of food, or appearing to do so.
Must be said with a south-west english accent (Cornwall, Devon, etc.)
Only works with the 'You' at the front, and only happens with 'You' and 'Bif' on one note, and 'fat'and 'fer' on a higher one.
There's no real emphasis anywhere, and it's deadpan despite the humourous intent.
"4 pints. And a pie."
"You fat biffer."
You fat biffer by davev July 15, 2005