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1.
Verb, transitive; to turn one's back on a person or persons in a social situation, so as to exclude them from the social circle, be it intentional or unintentional.
Noun; The act of breenusing someone.
English slang, origins in Sevenoaks School (Kent) pupil, Richard Breen, instigator of the original breenus.
We were all sitting around in a circle, when John sat down in the middle of the group, thereby breenusing half of those attending.
by Richard Tibbles August 01, 2004