It stands for "Bad Old Noona." A Bad Old Noona is an older woman still following the young pop scene (usually Korean) as a devoted & crazy fangirl, inappropriately attracted to insanely young pop stars (maknae like Taemin of SHINee or Seungri of BigBang).
I don't want to turn out to be a BON when I grow up! This fangirl thing -- waiting all night for tickets, writing love letters, sending him socks -- is exhausting.
by blupomodoro February 15, 2010
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An acronym for 'Benefits Of Neighbourliness'.

BON can be used as an adjective to describe a neighbourly act as good - See the example below.
Fred: "Boy am I glad I know my neighbour! He just gave me his old quad bike!"

George: "That's BON!"
by Meet Your Street July 30, 2010
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A battle cry used on the regular by team swollzilla. Used when achieving glory in the weight room by putting up an incredible amount of weight.

Also used in more subtle ways during conversation.
Swollzilla #1: (puts up amazing amount of weight) "BON!"

Swollzilla #2: That was heavy shit, bon. You going out tonight after this, bon?

Swollzilla #1: Yeah, bon. Fitting ta get my mac on, bon.
by SWOLLTANK November 03, 2010
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The most hurt Sister Location animatronic in history because of Funtime Freddy saying: HeY bOn BoN gO GeT eM! YeEt!
Freddy can you not throw Bon Bon against the wall for ONE FLIPPING TIME!!!!
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Candy (french), though used in North America as a slight on someone's junk eating habits
She gets so fat doing nothing but popping bon bons in front of the tele at night.
by ImperialZenta June 13, 2006
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