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2.
Abbreviation of the phrase "Bitching in Range." To talk negatively of a certain person/persons, when said party may be present within a distance capable of hearing such accusations. This often leads to an awkward silence, and a brief wave of severe guilt.
Adopted by a clan called 'The Cider-Riders' , the phrase has spread to mainstream use by the students of KEGs, which is a college in a town somewhere near Coventry.

'Remember to always check for BIR prior to bitching.'
Cider-Rider-1: "That Gemma is a right slag, and she's ugly"

Cider-Rider-2: "Shit check for B.I.R!"

*looks behind and all around*

Cider-Rider-1:*whispers* "oooooohmygod shes sitting behind us....."
by Davey2009 April 27, 2009
 
1.
bir
Dutch for wedgy... Bir is formed by the first letters of the condition "Broek In Reet", meaning "Pants in Ass"...
If somebody in Belgium kindly offers you a "bir", dont expect to get a nice cold beer...
by buddie hollie April 12, 2006
 
3.
bir
a Dutch Temptress of Napster Origin
Bir was and is an amazing woman
by Dizzier March 03, 2005