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1.
Seeming to be coolly unconcerned or indifferent.

-- its ALL good. no drama.none of that.
he broke up with me but im nonchalant.
by drill May 19, 2005
 
2.
Uncaring; Not To Enthusiastic, Angry or Annoyed By Things Going on; Calm
The Other Night Some Guy Tried To Get In A Fight With me, He Didn't Realize Me Being Nonchalant Made it Easier For Me To Beat Him
by Jason Timber February 09, 2005
 
3.
calm- Acting as if nothing happened
As my parents yelled at me i sat there with a nonchalant look on my face.

as i saw the fight happening in front of me i walked right by it in a nonchalant way.
by lovegame2122 September 01, 2009
 
4.
acting cool, calm,

having indifference or easy unconcern

Abby&Carina
Carina nonchalantly hung the cow up in the bathroom.

Abby was surprisingly nonchalant about winning most creative in art.
by penguin116 July 28, 2011
 
5.
to act as if you are humping something, humps a lot
Please stop nonchalanting that dog.
by what the heck72 June 17, 2010