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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.
BON by blupomodoro February 15, 2010
Related Words
boner bones bonk bong Bono bonkers Bonnie bonch bongos bonerific
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!"
BON by Meet Your Street July 31, 2010
Its nothing bad. It means good and it is a slang term used by people. It can be used in any situation and the person above this is an idiot. It is positive and means good in French thats where it is derived from.
if you have nothing to say...say Bon!
bon by thomas houshmanzedah October 11, 2006
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.
BON by SWOLLTANK November 4, 2010
Someone that is gay and can’t relate to other people, sometimes getting bullied by his co-workers.
Bon is gay and that’s a fact
Bon by vvern July 18, 2021
a sarcastic adjective derived from the french word for good
"i got 67 on the physics test"
"ya you bon physicist"
bon by lorenz4ever November 14, 2005